What's the relationship between the temperature and the density of a substance?

a. as the temperature increases, the density decreases.
b. as the temperature decreases, the density decreases.
c. temperature doesn't affect the density of a substance.
d. temperature decreases the density of a substance only at high altitudes.

The correct answer is option A, As the temperature increases, the density decreases

Explanation:

As the temperature of a substance is raised, the atoms and molecules within the substance gets heated. The heated subatomic particles starts vibrating at their position and induces vibration in the near by atoms/molecules too. Thus all the subatomic particle on heating gain kinetic energy and starts moving away from each other and thus the interatomic and intermolecular space between them increases. Now there are less number of atom/molecule in a given interatomic/molecular space. Therefore the density decreases.