Concentration is the ability to focus your mind on one task or thought without being distracted. In chemistry, it also refers to how much of one substance is present in a mixture or solution.
From 'concentrate' plus the noun-forming suffix '-ion'. It keeps the Latin root idea of 'bringing things to a center' and applies it both to mental focus and physical mixtures.
Your concentration works like a spotlight: you can shine it wide and weak, or narrow and strong, but not both at once. In a solution, 'high concentration' is like packing more and more people into a small room—there’s a lot of that substance in a small space.
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