Give two examples to show that the law of conservation of mass applies to physical changes also.

(N/A) The law of conservation of mass states that mass can neither be created nor destroyed in a system. This law holds true for physical changes as well,where the total mass of the substance remains constant before and after the physical transformation.
Examples:
$(i)$ Melting of wax: When a piece of wax melts,the mass of the solid wax is equal to the mass of the liquid wax formed.
$(ii)$ Melting of ice: When $100 \ g$ of ice melts into water,the mass of the resulting water is exactly $100 \ g$.