No. 12,643 in Russian
концентрация
Concentration; the action or power of focusing attention or the amount of a substance in a mixture.
In a sentence
Я достигаю оптимальной концентрации, когда работаю в тишине.
I achieve optimal concentration when working in silence.
Here, 'концентрация' is used to denote mental focus or attention.
Концентрация соли в этом растворе слишком высока.
The concentration of salt in this solution is too high.
In this sentence, 'концентрация' is used to refer to the proportion of a substance within a mixture.
При концентрации многих человек в небольшой комнате воздух становится душным.
When many people are concentrated in a small room, the air becomes stuffy.
This usage of 'концентрация' refers to the grouping or density of people in a given area.
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