Answer: physical change
Step-by-step explanation:
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Example: Dissolution of salt in water
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Oxidation of magnesium to give magnesium oxide
Thus physical change occurs when salt dissolves in water.