How is concentration typically expressed?

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.

Explanation:

concentration is usually expressed as the number possibilites per number of out comes of the concen traction of the which is he concentration refers to the he concentration of oxygen

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