Question

what is the effect of temperature on solids and liquids on the basis of density​

Answer 1

The molecules in a solid or liquid are held together by intermolecular forces of attraction.

• on heating a solid or liquid the intermolecular forces of attraction start to decrease, as the kinetic energies of the molecules increase.
• So, the molecules occupy a larger volume as the temperature goes up
• As, density = mass/volume, on increasing the volume of the substance, the density decreases.

Similarly, on cooling a substance, the volume decreases and hence, density increases.