Question

when a substance absorbs heat, mobility of the particles increases/decreases​

Answer 1

Answer:

The mobility of the particles increases .

Answer 2

Answer:

;)

Explanation:

When a solid absorbs heat the energy is stored in form of vibrational energy of the atoms or molecules, its a form of kinetic energy. In case of liquids and gases one can observe the actual motion of atoms/molecules. All these observations are found at the atomic level.

In macroscopic domain, we do not observe any motion. So we call this kinetic energy as potential energy, in this specific case thermal potential energy. Thus, when a material absorbs heat its thermal potential energy goes up and in the molecular scale the kinetic energy is increased. In case of ideal gases we calculate this energy using Kinetic Theory