Liquid
Volume = volume of container
In a solid, constituent particles (ions, atoms, or molecules) are closely packed together. The forces between particles are so strong that the particles cannot move freely but can only vibrate.
Shape = shape of container
A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure.
Solid
Gas
States of Matter
Plasma
Definite volume
Volume = volume of container
Shape = shape of container
The volume is definite if the temperature and pressure are constant.
Shape = shape of container
A gas is a compressible fluid. Not only will a gas conform to the shape of its container but it will also expand to fill the container.
Like a gas, plasma does not have definite shape or volume. Unlike gases, plasmas are electrically conductive, produce magnetic fields and electric currents, and respond strongly to electromagnetic forces.
Stable, definite shape
(Solids can only change their shape by force, as when broken or cut)