Question

Does matter expand in heat or cold

Answer 1

yes matter expand in heating only likeif we heat ice it will expand and become water.

Answer 2

Matter expands while heating.  

Explanation:

Matter is made up of small particles called as atoms. When the matter is heated, it leads to increase of kinetic energy of atoms present in it.

As a result of this hike in energy, the motion of the atoms increase and it leads to expansion of the matter. When the matter is cooled, it contracts due to decrease in kinetic energy and less amount of motion.