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polet [3.4K]
3 years ago
11

What refers to the number of particles of a substance per unit of volume?

Biology
1 answer:
katrin [286]3 years ago
6 0
Concentration refers to the number of particles of a substance per unit volume, in facile words, the amount of particles in a substance. 
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pic 1 red giant, a star whose outer shell has expanded and cooled

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