Which physical state of matter exhibits the greatest change in volume with changes or temperature or pressure?

It’s the gas physical state that shows the greatest change in volume and changes in temperature or pressure. Because gas is the matter that is composed of loose particles but can be compressed. Since gas contains loose molecules, the molecules can freely move in a certain object, so when physical change happens, it exhibit greatest change. Gas also follow the shape of its container and can expand in order to fill its container. It has no definite volume or shape.