A gas will undergo a change in volume more easily than either a liquid or a solid.
Gases adapt most easily to changes in volume.
Because gas takes the shape of it's container, it can change volume quite easily. No matter what container you put it in, a gas takes that shape and volume.
A state of matter that does not have a definite shape or definite volume would be a Gas. Gases are easily compressible compared to liquids, and change to any shape they occupy.
The matter that can change shape and volume is gas.
Gas
Assuming that pressure and the amount of matter are constant (meaning they do not change), volume will increase as temperature increases.
A solid has a definite shape and volume.
shape and volume
The state of matter that has no fixed volume and can flow is a liquid. Liquids take the shape of their container and can flow and change shape easily due to their particles having more freedom of movement than in a solid.
A liquid.
gas
it is a solid