Question

- mass per unit of volume of a substance is called its density. State whether the given statement is
a- true
b- false

Answer 1

mass is the actual matter contained in a body. Mass always remains the same; it does not change. Volume is the amount of water or any liquid that we can pour inside a container. The ratio of mass with volume is called density.

Complete step by step answer:
Density is a fundamental concept and it is extensively used in everyday lives to determine the purity of substances and for other means. Density can not be directly measured but it can be found out if we know the mass and the volume of the substance.
The ratio of mass with volume is called density. So, the given statement is true

So, the correct answer is “Option A”.

Additional Information:
Weight of an object is nothing but the force with which the earth pulls the body towards itself. We know weight is given by $W=Mg$, where M is the mass of the body and g is the acceleration due to gravity. There is another term called specific density which is defined as the ratio of density of a substance to the density of the water.

Note:
The SI unit of mass is Kilogram, kg and the SI unit of volume is metre cube, ${{m}^{3}}$. So, we can write density as $\rho =\dfrac{kg}{{{m}^{3}}}$. Density tells us the occupancy ratio. The average density of an object is equal to the ratio of total mass with the total volume.