CONCENTRATION中文(简体)翻译:剑桥词典
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英语-中文(简体)
concentration 在英语-中文(简体)词典中的翻译
concentrationnoun uk
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/ˌkɒn.sənˈtreɪ.ʃən/ us
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/ˌkɑːn.sənˈtreɪ.ʃən/
concentration noun
(ATTENTION)
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B2 [ U ] the ability to think carefully about something you are doing and nothing else
专注,专心
The noise outside made concentration difficult.
外面吵得我难以集中注意力。
There was a look of intense concentration on her face.
她脸上带着全神贯注的表情。
I find that yoga improves my powers of concentration.
我发现练瑜伽提高了我的注意力。
It was hard to follow what the teacher was saying, and eventually I lost concentration.
我发现自己难以理解老师在讲什么,最后就走神了。
The party's concentration on tax reduction has won them a lot of support.
政府集中推行减税政策,从而赢得了广泛的拥护。
更多范例减少例句This is a very difficult piece of music to play - it demands a lot of concentration.Heart surgery exacts tremendous skill and concentration.The job demands a high level of concentration.Hyperactive children often have poor concentration and require very little sleep.Even a low level of noise interferes with my concentration.
concentration noun
(AMOUNT)
C2 [ C or U ] a large number or amount of something in the same place
集中;聚集;汇集
There is a heavy concentration of troops in the area.
该地区有重兵驻扎。
[ C or U ]
chemistry
specialized the exact amount of one particular substance that is found in another substance
浓度
a concentration of one part per million
百万分之一的浓度
High concentrations of toxic elements were found in the polluted areas.
在被污染地区发现了高浓度的有毒元素。
concentration noun
(GAME)
[ U ] US (UK pelmanism) a card game in which players use their memory to try to find pairs of matching cards, turning over two cards at a time from a set of cards that are spread out face (= picture side) down
配对纸牌游戏
(concentration在剑桥英语-中文(简体)词典的翻译 © Cambridge University Press)
concentration的例句
concentration
In most of the previous studies only values for initial and final concentrations of cholesterol are given.
来自 Cambridge English Corpus
Each successive saliva sample might be expected to have progressively smaller concentrations of cortisol due to the diurnal cycle.
来自 Cambridge English Corpus
Major element concentrations are given as weight % of the oxides; trace element concentrations in ppm.
来自 Cambridge English Corpus
The assays are expensive to use and changes in concentrations can be missed if samples are not taken at the correct time.
来自 Cambridge English Corpus
Their concentrations are only partly coupled to the clay mineralogy.
来自 Cambridge English Corpus
One to 5 years postoperatively, 3 patients had normal concentrations of coagulation factors.
来自 Cambridge English Corpus
Among cassava cropping systems, no signi®cant dierences between nutrient concentrations were found.
来自 Cambridge English Corpus
In agreement with our experiments, they find vortex deformations and multiple vorticity concentrations in the near wake.
来自 Cambridge English Corpus
示例中的观点不代表剑桥词典编辑、剑桥大学出版社和其许可证颁发者的观点。
B2,C2
concentration的翻译
中文(繁体)
專心, 專注,專心, 數量…
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西班牙语
concentración, juego de la memoria, concentración [feminine]…
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葡萄牙语
concentração, concentração [feminine]…
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bir şeye yoğunlaşma, dikkatini toplama, konsantrasyon…
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concentration [feminine], concentration…
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concentració…
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concentratievermogen…
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நீங்கள் செய்கிற ஒன்றைப் பற்றி கவனமாக சிந்திக்கும் திறன் மற்றும் வேறு எதுவும் இல்லை, ஒரே இடத்தில் ஒரு பெரிய எண்ணிக்கை அல்லது அளவு, மற்றொரு பொருளில் காணப்படும் ஒரு குறிப்பிட்ட பொருளின் சரியான அளவு…
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एकाग्रता, (एक ही स्थान में) भारी मात्रा, (एक वस्तु में किसी अन्य वस्तु की) सांद्रता…
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એકાગ્રતા, એકત્રીકરણ, સાંદ્રીકરણ…
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koncentration…
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koncentration…
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kepekatan…
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die Konzentration…
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konsentrasjon [masculine], fokus [neuter], konsentrasjon…
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ارتکاز, مرکوزیت, اجتماع…
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концентрація, зосередженість…
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сосредоточенность, концентрация…
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ఏకాగ్రత, మీరు చేస్తున్న పని గురించి శ్రద్ధగా ఆలోచించడం., ఒకే స్థలంలో పెద్ద సంఖ్య లేక మొత్తం…
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تَرْكيز…
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মনোযোগ, একাগ্রতা, সমাবেশ…
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koncentrace, soustřeďování…
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konsentrasi…
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การให้ความสนใจ…
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sự tập trung…
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koncentracja, skupienie, stężenie…
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집중력…
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concentrazione…
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concentration的发音是什么?
在英语词典中查看 concentration 的释义
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conceivably
conceive
concentrate
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concept
concentration更多的中文(简体)翻译
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concentration camp
concentration, at pelmanism
re-concentration, at reconcentration
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flexitarian
A flexitarian way of eating consists mainly of vegetarian food but with some meat.
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Forget doing it or forget to do it? Avoiding common mistakes with verb patterns (2)
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英语-中文(简体)
Noun
concentration (ATTENTION)
concentration (AMOUNT)
concentration (GAME)
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CONCENTRATION中文(繁體)翻譯:劍橋詞典
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英語-中文(繁體)
concentration 在英語-中文(繁體)詞典中的翻譯
concentrationnoun uk
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/ˌkɒn.sənˈtreɪ.ʃən/ us
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/ˌkɑːn.sənˈtreɪ.ʃən/
concentration noun
(ATTENTION)
Add to word list
Add to word list
B2 [ U ] the ability to think carefully about something you are doing and nothing else
專注,專心
The noise outside made concentration difficult.
外面吵得我難以集中注意力。
There was a look of intense concentration on her face.
她臉上帶著全神貫注的表情。
I find that yoga improves my powers of concentration.
我發現練瑜伽提高了我的注意力。
It was hard to follow what the teacher was saying, and eventually I lost concentration.
我發現自己難以理解老師在講甚麼,最後就出神了。
The party's concentration on tax reduction has won them a lot of support.
政府集中推行減稅政策,從而贏得了廣泛的支持。
更多範例减少例句This is a very difficult piece of music to play - it demands a lot of concentration.Heart surgery exacts tremendous skill and concentration.The job demands a high level of concentration.Hyperactive children often have poor concentration and require very little sleep.Even a low level of noise interferes with my concentration.
concentration noun
(AMOUNT)
C2 [ C or U ] a large number or amount of something in the same place
集中;聚集;匯集
There is a heavy concentration of troops in the area.
該地區有重兵駐紮。
[ C or U ]
chemistry
specialized the exact amount of one particular substance that is found in another substance
濃度
a concentration of one part per million
百萬分之一的濃度
High concentrations of toxic elements were found in the polluted areas.
在受污染地區發現了高濃度的有毒元素。
concentration noun
(GAME)
[ U ] US (UK pelmanism) a card game in which players use their memory to try to find pairs of matching cards, turning over two cards at a time from a set of cards that are spread out face (= picture side) down
配對紙牌遊戲
(concentration在劍橋英語-中文(繁體)詞典的翻譯 © Cambridge University Press)
concentration的例句
concentration
Regrettably, cyclosporine concentrations that are only minimally effective produce nephrotoxic effects, especially in kidneys that have pre-existing damage.
來自 Cambridge English Corpus
Maximum particle concentrations are reached near the stagnation point.
來自 Cambridge English Corpus
The lower compartment of the wells also contained various concentrations of mactinin and was separated from the upper chamber by a polycarbonate filter.
來自 Cambridge English Corpus
The tests consist of a control and a minimum of five effluent concentrations.
來自 Cambridge English Corpus
In zones 1 to 5, the concentrations of major elements remain virtually constant, whereas in zones 6 to 12 they show considerable gradation.
來自 Cambridge English Corpus
In contrast, variations in exercise resulted in differences in bone marker concentrations and bone quality in seven of eight studies.
來自 Cambridge English Corpus
In most of the previous studies only values for initial and final concentrations of cholesterol are given.
來自 Cambridge English Corpus
During normal pregnancy, there is an exponential increase in cortisol concentrations in the fetal circulation.
來自 Cambridge English Corpus
示例中的觀點不代表劍橋詞典編輯、劍橋大學出版社和其許可證頒發者的觀點。
B2,C2
concentration的翻譯
中文(簡體)
专心, 专注,专心, 数量…
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西班牙語
concentración, juego de la memoria, concentración [feminine]…
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葡萄牙語
concentração, concentração [feminine]…
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एकाग्रता, एकवटणे, तीव्रता…
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集中力, 集中(しゅうちゅう), 集団(しゅうだん)…
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bir şeye yoğunlaşma, dikkatini toplama, konsantrasyon…
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concentration [feminine], concentration…
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concentració…
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concentratievermogen…
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நீங்கள் செய்கிற ஒன்றைப் பற்றி கவனமாக சிந்திக்கும் திறன் மற்றும் வேறு எதுவும் இல்லை, ஒரே இடத்தில் ஒரு பெரிய எண்ணிக்கை அல்லது அளவு, மற்றொரு பொருளில் காணப்படும் ஒரு குறிப்பிட்ட பொருளின் சரியான அளவு…
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एकाग्रता, (एक ही स्थान में) भारी मात्रा, (एक वस्तु में किसी अन्य वस्तु की) सांद्रता…
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એકાગ્રતા, એકત્રીકરણ, સાંદ્રીકરણ…
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koncentration…
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koncentration…
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kepekatan…
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die Konzentration…
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konsentrasjon [masculine], fokus [neuter], konsentrasjon…
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ارتکاز, مرکوزیت, اجتماع…
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концентрація, зосередженість…
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сосредоточенность, концентрация…
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ఏకాగ్రత, మీరు చేస్తున్న పని గురించి శ్రద్ధగా ఆలోచించడం., ఒకే స్థలంలో పెద్ద సంఖ్య లేక మొత్తం…
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تَرْكيز…
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মনোযোগ, একাগ্রতা, সমাবেশ…
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koncentrace, soustřeďování…
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konsentrasi…
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การให้ความสนใจ…
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sự tập trung…
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koncentracja, skupienie, stężenie…
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집중력…
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concentrazione…
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concentration的發音是什麼?
在英語詞典中查看 concentration 的釋義
瀏覽
conceivably
conceive
concentrate
concentrated
concentration
concentration camp
concentrator
concentric
concept
concentration更多的中文(繁體)翻譯
全部
concentration camp
concentration, at pelmanism
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Noun
concentration (ATTENTION)
concentration (AMOUNT)
concentration (GAME)
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欧路词典|英汉-汉英词典 concentration是什么意思_concentration的中文解释和发音_concentration的翻译_concentration怎么读
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n. 专心,专注;关注,重视;集中,聚集;浓度,含量
近义、反义、联想词
词n. property, spacing, spatial arrangement, strengthening, increase, attention, assembly反词n. distribution, dispersion, dilution联想词solubility溶度,溶性,可解决性,可解释性,溶解性;intensity强烈, 剧烈;selectivity选择性;sensitivity敏感;absorption吸收,吸收作用;saturation饱和;impurity杂质;dilution稀释,冲淡;adsorption吸附;analyte分析物;dissociation分离;
词组 | 习惯用语
concentration of sth 集中;聚集high concentration 高浓度,高强度stress concentration 应力集中concentration on 注意力集中于…low concentration 低浓度;低集中度gas concentration 气体浓度;气含量sediment concentration 含沙量;沉积物浓度solution concentration 溶液浓度ion concentration 离子浓度dust concentration 尘浓度;尘末浓度mass concentration 质量浓度concentration camp 集中营initial concentration 起始浓度;初浓度salt concentration 盐浓度,含盐浓度concentration ratio 集中度;浓度比率concentration factor 集中系数;浓缩系数alcohol concentration 酒精浓度concentration polarization 浓差极化stress concentration factor 应力集中系数volume concentration [化]体积浓度;体积密度
英语例句库
a short concentration span.短期集中时间段。concentrations of enemy troops敌军集结his concentration was broken by a sound.响声打断了他专心致志。the concentration of power in the hands of nobles.贵族手里集中权力。Conditions in the office made concentration impossible.办公室根本不可能使人专心With great concentration she went through the movements.她聚精会神地做完这些动作。nonenzymatic browning of greengage juice was restrained more remarkably by vacuum concentration than by normal pressure concentration;减压浓缩较常压浓缩明显抑制了非酶褐变发生;concentration on the needs of the young can mean that the elderly are forgotten.对年轻人需求注重可能意味着对老年人忽视。a lapse of concentration in the second set cost her the match.第二局中她一失神失败了。direct read-out of concentration in ug or mg/l.以微克/升或毫克/升表示直接示值浓度读数。total concentration; a total effort; a total fool.完全集中;孤注一掷努力;彻头彻尾傻瓜What is the concentration of salt in sea water?海水中盐含量是多少?Large concentrations of capital were in the hands of merchants.大量资本集中在商人手里。The result shows that catalyst concentration, reaction time, urushiol concentration and temperatures affect the polymer yield in oxypolymerization of urushiol system.讨论了该配合物作为催化剂,催化漆酚氧化聚合反应时,催化剂浓度、时间、底物浓度以及温度对漆酚氧化聚合反应影响。the concentration necessary to her job blotted out all the feelings.她工作需要精神集中,这使她没有任何感觉。the island has the greatest concentration of seabirds in the north-west.此岛集中了西北部最多海鸟。too much concentration on set texts can turn pupils against reading.太注重指定书本会使小学生讨厌阅读。The vapor phase concentration of durene could be adjusted by the self-made adjustor.自制高熔点物料气相浓度调控仪能很好地调控气相中均四甲苯浓度,具有推广应用价值。声明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件观点;若发现问题,欢迎向我们指正。显示所有包含 concentration 的英语例句
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CONCENTRATION在剑桥英语词典中的解释及翻译
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concentration 在英语中的意思
concentrationnoun uk
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/ˌkɒn.sənˈtreɪ.ʃən/ us
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/ˌkɑːn.sənˈtreɪ.ʃən/
concentration noun
(ATTENTION)
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B2 [ U ] the ability to think carefully about something you are doing and nothing else: The noise outside made concentration difficult. There was a look of intense concentration on her face. I find that yoga improves my powers of concentration. It was hard to follow what the teacher was saying, and eventually I lost concentration. The party's concentration on tax reduction has won them a lot of support.
更多范例减少例句This is a very difficult piece of music to play - it demands a lot of concentration.Heart surgery exacts tremendous skill and concentration.The job demands a high level of concentration.Hyperactive children often have poor concentration and require very little sleep.Even a low level of noise interferes with my concentration.
“SMART 词汇”:相关单词和短语
Paying attention and being careful
attention span
attentiveness
baby
be good, and if you can't be good, be careful idiom
be on (your) guard idiom
get religion idiom
guard
hang
hang on/upon something
have a care idiom
religion
revolve
revolve around someone/something
safety
safety first idiom
see past something
sit
the/a glare of something idiom
zero
Zoom
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concentration noun
(AMOUNT)
C2 [ C or U ] a large number or amount of something in the same place: There is a heavy concentration of troops in the area.
[ C or U ]
chemistry
specialized the exact amount of one particular substance that is found in another substance: a concentration of one part per million High concentrations of toxic elements were found in the polluted areas.
“SMART 词汇”:相关单词和短语
Collecting and amassing
accumulate
agglomerate
aggregation
amass
assemble
bunch
compile
completism
completist
compost
concentrate
cumulate
fundraise
fundraising
harvest
put something together
rake something up
reassemble
reconcentrate
reconcentration
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你还可以在这些话题中找到相关的词、词组和同义词:
Physics: the state of matter
concentration noun
(GAME)
[ U ] US (UK pelmanism) a card game in which players use their memory to try to find pairs of matching cards, turning over two cards at a time from a set of cards that are spread out face (= picture side) down
(concentration在剑桥高级学习词典和同义词词典中的解释 © Cambridge University Press)
concentration | 美式英语词典
concentrationnoun us
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/ˌkɑn·sənˈtreɪ·ʃən/
concentration noun
(COMING TOGETHER)
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a large amount of something in the same place: [ C ] There’s a heavy concentration of poor and elderly in the district.
concentration noun
(GIVING ATTENTION)
[ U ] a lot of attention and thought directed to an activity or subject: He had a look of intense concentration on his face.
concentration noun
(SUBSTANCE)
the amount of a substance that is mixed with water or another substance
(concentration在剑桥学术词典中的解释 © Cambridge University Press)
concentration | 商务英语
concentrationnoun uk
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/ˌkɒnsənˈtreɪʃən/ us
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Add to word list
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[ C or U ] the fact of there being a large number or amount of people or things of the same type in the same place: The state's highest concentration of wealth is in the metro areas. Denver has one of the biggest concentrations of tech workers in the country. By identifying geographical concentrations of industries, we can identify training needs that exist in those regions.
[ U ] the fact of things being combined into a single group, or controlled by the same person or organization: This situation has resulted in the concentration of the industry in the hands of a few multinational companies.
[ U ] the ability to give all of your attention to one particular activity, subject, or problem: Low costs and concentration on core business activities form the basis of our success. Many of the mistakes she made in the job were due to a lack of concentration. 也请参见
buyer concentration
market concentration
(concentration在剑桥商务英语词典中的解释 © Cambridge University Press)
concentration的例句
concentration
The primary underlying abnormality in this model was inability of neuronal tissue properly to regulate extracellular potassium concentrations.
来自 Cambridge English Corpus
The tests consist of a control and a minimum of five effluent concentrations.
来自 Cambridge English Corpus
Data from effluent concentrations that have tested significantly different from the control for survival are excluded from further hypothesis tests concerning growth effects.
来自 Cambridge English Corpus
In most of the previous studies only values for initial and final concentrations of cholesterol are given.
来自 Cambridge English Corpus
Changes in ventilator settings were limited to temporary increases in inspired oxygen concentrations to alleviate hypoxemia (pulse oximetry saturation less than 90%).
来自 Cambridge English Corpus
An upward deviation from ideal was occasionally observed at the lower concentrations, as the detection limit was approached.
来自 Cambridge English Corpus
We conclude from this experiment that detection down to concentrations of 0.1 ng/ml and partial concentrations of 10 -6is possible using antigen arrays.
来自 Cambridge English Corpus
Visual examination of the table shows that both black and brown color had notably higher concentrations than either blond-haired or gray-haired subjects.
来自 Cambridge English Corpus
Ceftriaxone has the additional complication that the protein binding is non-linear, saturating at high concentrations.
来自 Cambridge English Corpus
After 40 minutes the muscle tissue concentrations for the permeability limited and flow limited cases are not significantly different.
来自 Cambridge English Corpus
The lower compartment of the wells also contained various concentrations of mactinin and was separated from the upper chamber by a polycarbonate filter.
来自 Cambridge English Corpus
The flowcytometric analysis using special software allows the calculation of concentrations in the unknown sera.
来自 Cambridge English Corpus
Sepsis can cause occult adrenal insufficiency in the presence of normal or even elevated serum cortisol concentrations.
来自 Cambridge English Corpus
The lowest concentrations were found in those dosed at higher levels.
来自 Cambridge English Corpus
The parallel use of two different concentrations of the same drug is a questionable practice, in particular as they were kept in the same cupboard.
来自 Cambridge English Corpus
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包含concentration的固定搭配
concentration
这些词常常与concentration一起使用。点击固定搭配,查看更多示例。
atmospheric concentrationSeasonal variation in atmospheric concentration of fungal spores has been documented for some moulds in several geographical locations.
来自 Cambridge English Corpus
average concentrationBars represent the average concentration (in dry weight) for groups of samples taken from fish at different time points after vaccination.
来自 Cambridge English Corpus
banking concentrationBanking concentration is measured by the fraction of assets held by the three largest commercial banks in each country averaged over the period 1995-1999.
来自 Cambridge English Corpus
示例均来自剑桥英语语料库及网络资源。示例中的观点不代表剑桥词典编辑、剑桥大学出版社和其许可证颁发者的观点。
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concentration的翻译
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專心, 專注,專心, 數量…
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专心, 专注,专心, 数量…
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concentración, juego de la memoria, concentración [feminine]…
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concentração, concentração [feminine]…
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concentration [feminine], concentration…
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நீங்கள் செய்கிற ஒன்றைப் பற்றி கவனமாக சிந்திக்கும் திறன் மற்றும் வேறு எதுவும் இல்லை, ஒரே இடத்தில் ஒரு பெரிய எண்ணிக்கை அல்லது அளவு, மற்றொரு பொருளில் காணப்படும் ஒரு குறிப்பிட்ட பொருளின் சரியான அளவு…
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koncentration…
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Noun
concentration (ATTENTION)
concentration (AMOUNT)
concentration (GAME)
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concentration (COMING TOGETHER)
concentration (GIVING ATTENTION)
concentration (SUBSTANCE)
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concentration - WordReference.com 英汉词典
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UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌkɒnsənˈtreɪʃən/US:USA pronunciation: IPAUSA pronunciation: IPA/ˌkɑnsənˈtreɪʃən/US:USA pronunciation: respellingUSA pronunciation: respelling(kon′sən trā′shən)
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WordReference English-Chinese Dictionary © 2024:主要翻译英语中文
concentration n (mental focus) (精力的)SCSimplified Chinese 集中,专注,专心 jí zhōng ,zhuān zhù,zhuān xīn TCTraditional Chinese 集中,專心
My powers of concentration aren't what they used to be.
concentration n (density)SCSimplified Chinese 集中 jí zhōng TCTraditional Chinese 集中
The concentration of trees increases with rainfall amounts.
concentration n (chemistry: strength of substance) (化学)SCSimplified Chinese 浓度 nóng dù TCTraditional Chinese 濃度
You'll need to increase the concentration of chlorine.
有所遗漏?报告错误或提出改进建议
WordReference English-Chinese Dictionary © 2024:复合形式:英语中文
area of concentration n (zone of highest incidence)SCSimplified Chinese 集中区域,集中地区
area of concentration n US (education: field of study) (教育)SCSimplified Chinese 专门研究领域
His area of concentration at the Kennedy School of Government was the Middle East.
concentration camp n (camp for political prisoners)SCSimplified Chinese 集中营 jí zhōng yíng TCTraditional Chinese 集中營
Dachau was one of the most notorious concentration camps of World War 2.
达豪集中营是二战期间最臭名昭著的集中营之一。
lapse in concentration n (moment of inattention)SCSimplified Chinese 一时走神 yì shí zǒu shén TCTraditional Chinese 一時走神
I had a lapse in concentration on my way here and missed the turning.
lose concentration vtr + n (stop paying attention)SCSimplified Chinese 不再注意 bú zài zhù yì
He'll lose concentration if you keep pulling faces at him.
loss of concentration n (inability to continue paying attention)SCSimplified Chinese 不能集中精力 bù néng jí zhōng jīng lì
In sports, a loss of concentration can mean losing the game.
make [sb] lose his concentration, make [sb] lose her concentration v expr (distract [sb])SCSimplified Chinese 使…分心 shǐ fēn xīn
SCSimplified Chinese 转移…注意力 shǐ fēn xīn,zhuǎn yí zhù yì lì
The loud music made me lose my concentration.
有所遗漏?报告错误或提出改进建议
Collins Chinese Dictionary Plus (3rd edition), 2011:
concentration [kɔnsənˈtreɪʃən]
n
1
[u]
(=ability to concentrate) 专(專)心 zhuānxīn
2
[u]
(=focus) ▶ concentration on sth/on doing sth 集中于(於)某事/做某事 jízhōng yú mǒushì/zuò mǒushì
3
[c/u]
(in one area, space) 集中 jízhōng
4
[c/u]
(Chem) 浓(濃)度 nóngdù
在这些条目还发现'concentration':
在英文解释里:
absorption
- attention span
- BAC
- cathexis
- centralization
- death camp
- distraction
- engrossment
- focus
- forced-labour camp
- frown
- high-density
- intently
- lapse
- mental effort
- refocus
- serious
- titre
- total immersion
- tune out
- undivided attention
中文:
专心
- 克分子浓度
- 浓度
在单词列表中: Card games, 更多……同义词: focus, attention, close attention, thought, deep thought, 更多……
标题中含有单词 'concentration' 的论坛讨论:未在Chinese论坛中找到有关“concentration”的讨论‘resource concentration’ that may be transformed ....... - English Only forum
(bright) concentration of a chipmunk - English Only forum
A concentration of buyers - English Only forum
A high concentration of people. - English Only forum
an analyte concentration - English Only forum
at a concentration - English Only forum
attract a really remarkable concentration of - English Only forum
Auschwitz concentration camp/the Auschwitz concentration camp - English Only forum
best concentration - English Only forum
co-concentration - English Only forum
Concentrated or concentration - English Only forum
concentration - English Only forum
concentration - English Only forum
Concentration - English Only forum
Concentration and accumulation of knowledge - English Only forum
concentration
concentration of groups - English Only forum
concentration of the individual's thoughts - English Only forum
Concentration or concentrations; derivative or derivatives? - English Only forum
concentration was shot - English Only forum
concentration-dependent line - English Only forum
Concentration, Match Match, Pexeso, Pairs (game) - English Only forum
cone of concentration - English Only forum
densification vs. concentration - English Only forum
Difference between mental focus and concentration - English Only forum
diffuse concentration - English Only forum
director of my concentration - English Only forum
enhance your concentration/focus/mindfulness - English Only forum
for such, the geographical concentration... - English Only forum
giving/paying full concentration - English Only forum
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Concentration Definition (Chemistry)
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Concentration Definition (Chemistry)
What Concentration Means in Chemistry
In a solution, concentration is the amount of solute per volume of solvent.
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By
Anne Marie Helmenstine, Ph.D.
Anne Marie Helmenstine, Ph.D.
Chemistry Expert
Ph.D., Biomedical Sciences, University of Tennessee at Knoxville
B.A., Physics and Mathematics, Hastings College
Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels.
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Updated on February 12, 2020
In chemistry, the word "concentration" relates to the components of a mixture or solution. Here is the definition of concentration and a look at different methods used to calculate it.
Concentration Definition
In chemistry, concentration refers to the amount of a substance in a defined space. Another definition is that concentration is the ratio of solute in a solution to either solvent or total solution. Concentration is usually expressed in terms of mass per unit volume. However, the solute concentration may also be expressed in moles or units of volume. Instead of volume, concentration may be per unit mass. While usually applied to chemical solutions, concentration may be calculated for any mixture.
Unit Examples of Concentration: g/cm3, kg/l, M, m, N, kg/L
How to Calculate Concentration
Concentration is determined mathematically by taking the mass, moles, or volume of solute and dividing it by the mass, moles, or volume of solution (or, less commonly, the solvent). Some examples of concentration units and formulas include:
Molarity (M) - moles of solute/liters of solution (not solvent!)
Mass Concentration (kg/m3 or g/L) - mass of solute/volume of solution
Normality (N) - grams active solute/liters of solution
Molality (m) - moles of solute/mass of solvent (not mass of solution!)
Mass Percent (%) - mass solute/mass solution x 100% (mass units are the same unit for both solute and solution)
Volume Concentration (no unit) - volume of solute/volume of mixture (same units of volume for each)
Number Concentration (1/m3) - number of entities (atoms, molecules, etc.) of a component divided by the total volume of the mixture
Volume Percent (v/v%) - volume solute/volume solution x 100% (solute and solution volumes are in the same units)
Mole Fraction (mol/mol) - moles of solute/total moles of species in the mixture
Mole Ratio (mol/mol) - moles of solute/total moles of all other species in the mixture
Mass Fraction (kg/kg or parts per) - mass of one fraction (could be multiple solutes)/total mass of the mixture
Mass Ratio (kg/kg or parts per) - mass of solute/mass of all other constituents in the mixture
PPM (parts per million) - a 100 ppm solution is 0.01%. The "parts per" notation, while still in use, has largely been replaced by mole fraction
PPB (parts per billion) - typically used to express contamination of dilute solutions
Some units may be converted from one to another. However, it's not always a good idea to convert between units based on the volume of solution to those based on mass of solution (or vice versa) because volume is affected by temperature.
Strict Definition of Concentration
In the strictest sense, not all means of expressing the composition of a solution or mixture fall under the simple term "concentration". Some sources only consider mass concentration, molar concentration, number concentration, and volume concentration to be true units of concentration.
Concentration Versus Dilution
Two related terms are concentrated and dilute. Concentrated refers to chemical solutions that have high concentrations of a large amount of solute in the solution. If a solution is concentrated to the point where no more solute will dissolve in the solvent, it is said to be saturated. Dilute solutions contain a small amount of solute compared with the amount of solvent.
In order to concentrate a solution, either more solute particles must be added or some solvent must be removed. If the solvent is nonvolatile, a solution may be concentrated by evaporating or boiling off solvent.
Dilutions are made by adding solvent to a more concentrated solution. It's common practice to prepare a relatively concentrated solution, called a stock solution, and use it to prepare more dilute solutions. This practice results in better precision than simply mixing up a dilute solution because it can be difficult to obtain an accurate measurement of a tiny amount of solute. Serial dilutions are used to prepare extremely dilute solutions. To prepare a dilution, stock solution is added to a volumetric flask and then diluted with solvent to the mark.
Source
IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997).
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Helmenstine, Anne Marie, Ph.D. "Concentration Definition (Chemistry)." ThoughtCo, Apr. 5, 2023, thoughtco.com/definition-of-concentration-605844.
Helmenstine, Anne Marie, Ph.D. (2023, April 5). Concentration Definition (Chemistry). Retrieved from https://www.thoughtco.com/definition-of-concentration-605844
Helmenstine, Anne Marie, Ph.D. "Concentration Definition (Chemistry)." ThoughtCo. https://www.thoughtco.com/definition-of-concentration-605844 (accessed March 9, 2024).
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Calculating Concentrations with Units and Dilutions
Mass Percentage Definition and Example
Convert Molarity to Parts Per Million Example Problem
Calculating the Concentration of a Chemical Solution
Solubility Definition in Chemistry
The Difference Between Molality and Molarity
What Is a Mole Fraction?
How to Calculate Mass Percent Composition
Phosphate-Buffered Saline or PBS Solution
How to Prepare Common Acid Solutions
Dilution Calculations From Stock Solutions
Topics Typically Covered in Grade 11 Chemistry
Chemistry Vocabulary Terms You Should Know
How to Make a Phosphate Buffer Solution
pH and pKa Relationship: The Henderson-Hasselbalch Equation
Acids and Bases: Titration Example Problem
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concentration noun - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com
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Definition of concentration noun from the Oxford Advanced Learner's Dictionary
concentration noun /ˌkɒnsnˈtreɪʃn/ /ˌkɑːnsnˈtreɪʃn/
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[uncountable] the ability to direct all your effort and attention on one thing, without thinking of other thingsThis book requires a great deal of concentration.Tiredness affects your powers of concentration.One momentary lapse in concentration could prove fatal.He has a poor concentration span (= cannot concentrate for long) Extra ExamplesDon's voice from outside broke my concentration.She has great powers of concentration for a child her age.The game requires great concentration.a look of total concentration on her faceThe noise had disturbed his concentration.The manager criticized the players for showing a lack of concentration.Oxford Collocations Dictionaryadjectivedeepgreatintense…verb + concentrationdemandneedrequire…concentration + nounlapseprepositionconcentration onphrasesa lack of concentrationa lapse in concentrationa lapse of concentration…See full entry
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[uncountable] concentration (on something) the process of people directing effort and attention on a particular thingHe stressed the need for greater concentration on environmental issues.In his concentration on the job in hand, John allowed his normal vigilance to slip.
[countable] concentration (of something) a lot of something in one placea concentration of industry in the north of the countryExtra ExamplesThe greatest concentration of traffic is in the city centre.The greatest concentration of traffic is downtown.Oxford Collocations Dictionaryadjectiveelevatedgreatheavy…verb + concentrationincreasedecreasereduce…concentration + verbincreaserisedecrease…See full entry [countable, uncountable] the amount of a substance in a liquid or in another substanceglucose concentrations in the bloodExtra ExamplesEvaporation gradually increases the salt concentration of the water.The concentration of nitrates in the drinking water has risen in recent years. See concentration in the Oxford Advanced American DictionarySee concentration in the Oxford Learner's Dictionary of Academic EnglishCheck pronunciation:
concentration
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concentration camp noun
concentration camps
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concentrated adjective
concentrate on phrasal verb
concentration noun
concentration camp noun
concentric adjective
justification
noun
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