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'concentrations' is a correct and usable word in written English
It can be used to refer to the amount or proportion of a substance in a specific volume or area, or the act of focusing or directing one's attention or efforts towards a specific thing or goal. Example 1: The lab results showed high concentrations of lead in the drinking water, raising concerns among residents about potential health hazards. Example 2: He struggled to maintain his concentrations during the long study sessions, but he was determined to pass the exam with flying colors.
Dictionary
concentrations
noun
Plural of concentration
Exact(60)
Two were given a gel containing PRO 2000 (in different concentrations for each group), along with advice about how to use it, a regular supply of condoms and counselling on safe sexual practice and sexual health.
The UK government, which cannot appeal against the European judgment, responded by saying: "Roadside concentrations of NO2 levels have fallen 15% since 2010.
The report found concentrations of total and dissolved nickel (0.041 mg/L and 0.037 mg/L, respectively) that exceeded Australian drinking water guidelines.
Brighton has one of the highest concentrations of students in the UK – 13% of the population – with numbers up from 25,589 in 1996 to around 34,000 now.
The Greening Earth Society actively promoted the – false – notion that climate change was actually a net positive, claiming that rising temperatures and atmospheric concentrations of carbon dioxide would help plants grow.
The NWRA's climate change web page says there has been "a significant increase in atmospheric concentrations of greenhouse gases" in the last two decades, and that: "Scientific consensus is clear: these emissions are making the earth warmer in an unusually fast time period".
As Rob Ford, who has studied this phenomenon close up, has written: "Ukip's advance was strongest in seats with the largest concentrations of white voters, working-class voters, voters with no educational qualifications, and where opposition to immigration and the EU was highest".
Senior voices in the party are now warning that the concentrations of the nominations among two candidates could prevent others from standing and restrict the debate about what type of leadership is needed.
His argument then was the same as it is now, when he wrote: It sounds like common sense to minimise human impact on the environment and to reduce the human contribution to increased atmospheric-gas concentrations.
Mexico has one of the highest concentrations of gated communities in the world, while in South Africa, large-scale, private "security estates" have come under the spotlight with the trial of paralympian Oscar Pistorius, who is accused of killing his girlfriend at home in the exclusive, 90-acre Silver Woods country estate.
The paper in question dealt with the sensitivity of the climate to rises in greenhouse gases, claiming to have found inconsistencies in recent analyses of how much temperature is likely to rise if concentrations in the atmosphere should increase.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com