What happens when a substance undergoes a physical change?

A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

When a substance undergoes a physical change, there is a change of state coupled with the release or absorbtion of energy.

Explanation:

A physical change is a reversible transformation of an object from one form to another that can be observed. In this case, it occurs majorly when an object releases or absorbs a definite amount of energy (e.g heat). It does not affect the chemical composition of the object.

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!