Question

Question 27:
(a) What is the difference between the density and relative density of a substance ?
(b) If the relative density of a substance is 7.1, what will be its density in SI units ?

Lakhmir Singh Physics Class 9

Answer 1

(^^)Mass per unit volume of a substance is called density. i. The ratio between density of a substance and density of water is called relative density. ... Units: Relative density has no units because it is the ratio between the similar physical quantities (density).

(^^) Relative Density = 7. 1
Density = R.D * 1000 Kg/m³
= 71 Kg/m³ (Ans...)

Hope it helps you out ^_^
Thanks....☺

Answer 2

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• Density is defined as mass per volume. Density of a material is the amount of substance contained in unit volume of the material. SI unit of density is kg/m³.

• Relative density is the ratio of density of a substance to the density of a reference material. Usually, the reference material is water. Relative density is also known as specific gravity.