Question

Why are some units of concentration unitless?
A. Just because
B. Because it is a ratio of two similar quantities
C. Because it is a ratio of two different quantities
D. Because it is not a ratio of two similar quantities

Answer 1

Answer:

In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is assigned, also known as a bare, pure, or scalar quantity or a quantity of dimension one,[1] with a corresponding unit of measurement in the SI of the unit one (or 1),[2][3] which is not explicitly shown. Dimensionless quantities are widely used in many fields, such as mathematics, physics, chemistry, engineering, and economics. Dimensionless quantities are distinct from quantities that have associated dimensions, such as time (measured in seconds).

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Answer 2

Answer:

C = Because it is a ratio of two different quantities