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Only solids have a defined, constant shape.
In the solid and liquid states of matter, volume is constant because the amount of matter does not change. In a gas however volume can change because of the amount of pressure and the temperature, which heats up the particles making them move around more and take up more space.
Plasma!
Assuming that pressure and the amount of matter are constant (meaning they do not change), volume will increase as temperature increases.
Liquids and solids are the states of matter that occupy a definite volume. Gases have neither a definite volume nor shape.
A given mass of gas can assume any shape and volume; a given mass of liquid can assume any shape but has a constant volume; and a given mass of a single solid has a fixed shape and volume.
Liquids. By assuming that temperature and pressure are constant so that volume does not change.
There are two states of matter that has no definite volume or shape. They are a gas and plasma. Solid matter has a definite shape and volume.
Solid, liquid, and plasma states have definite volume.
the liquid state of matter
The constant Volume process, also known as Isovolumetric, is where the volume is constant and does not change. In a P, V, Diagram this should be where volume is constant where Pressure is increased. The work done (area under the curve) would be = to 0 in this case.
Changes in the states of matter - or phase changes - do entail changes in volume.