The unit for specific gravity is ______.
no unit (dimensionless)
The correct answer is no unit (dimensionless).
Specific gravity is the ratio of the density of a substance to the density of a reference substance; oftentimes, water is used as the reference. Since it's a ratio of two densities (which have the same units), the units cancel out, resulting in a dimensionless quantity. Therefore, specific gravity has no unit.
Let's illustrate this:
Specific Gravity = Density of substance / Density of water
If density is measured in kg/m³, then:
Specific Gravity = (kg/m³) / (kg/m³) = 1 (dimensionless)
The same principle applies if the density is expressed in g/cm³ or any other unit of density.
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