Question

(i) Why the relative density has no units?​

Answer 1

QUESTION :

Why the relative density has no units ?

ANSWER :

Relative density is defined as the ratio of the desnsity of substance to the ratio of the density of reference substance ( water at 4° C is usually taken as reference substance).

$Relative\: density =\frac{Density \: of \: the \:substance}{Density \: of \: water \: at \: 4°C.}$

Since , unit on numerator and denominator are same ( i.e kg/m³) , so they get cancelled and relative density has no unit. It is a unitless property.

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Learn more :-

Density :- The density is the mass of the body per unit volume. S.I unit of density is kg/m³.

$density \: = \frac{mass}{volume}$

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Answer 2

Answer:

relative density is the ratio of the density of a substance to the density of water at 4 degree C.

Ratios do not have units as ratio is always between quantities having same unit and when two same units are divided they get cancelled out. Thus relative density has no ratio