It is a physical change because of the decrease in temperature. Material changes remain the same substance. However, its appearance may change. Chemical changes are often more difficult to reverse than physical changes.
Physical changes include color change, temperature change, light is given off, or bubbles. Chemical changes, on the other hand, occur when bonds are broken between molecules and atoms. A physical change may produce a marked difference in the appearance of a substance.
Some common material changes include melting ice, shredding paper, chopping wood, and mixing different color marbles. Changing the state of a pure material between solid, liquid, and gas phases of matter are all physical changes.