it changes when it gets cold
It can change from a gas to a solid to a liquid, or from a liquid to a solid to a gas. This change does not affect the composition of the matter.
When a matter changes from a gas to a liquid it is called condensation.
condensation
Generally the temperature of the material. Pressure can change the temperatures at which transformations occur.
A solid, or even a gas. And back again (improved)liquid is a state of matter, which can be a solid, liquid, or gas. therefore, liquid can be changed into a solid or a gas. to do so, just change the temperature of the matter. :-D
In a word, temperature. A physical change will change the matter's state based on it's temperature. For example, water, H2O. You can increase the temperature to 212oF and it will change state from a liquid to a gas. You can decrease the temperature to 32oF and it will change state from a liquid to a solid. To answer your question, the process of doing so would be increasing or decreasing temperature of matter.
The change of state of matter from a gas to a liquid is called condensation.
It's called condensation when a gas changes to a liquid
the matter can change into liquid, solid and gas.
Condensation
condensation
liquefication