Question

(d) Hotness or coldness are
terms, and not
(e) Change of state can be caused by
or
a substance.​

Answer 1

Explanation:

Heat energy is basically the energy of the movement of molecules.

Molecules are tightly packed in solids as compared to liquids and gases, similarly, molecules of a liquid are bound more as compared to gases. That's why when solids are heated they expand less as compared to liquids and liquids expand less as compared to gases. In gases, molecules are not bound at all, so they expand maximum upon heating.