Particles must slow down, and energy must be provided.
A liquid is a nearly incompressible fluid that adapts to the shape of its container and maintains an (almost) constant volume under all conditions of pressure. The volume is fixed if the temperature and pressure are both constant. A solid turns into a liquid when it is heated past its melting point and under pressure that is higher than its triple point. The molecules have enough energy to move around, and the structure is mobile even though intermolecular (or interatomic or interionic) interactions still exist. This suggests that a liquid's form is dictated more by its container than by the liquid itself. Water (H2O) is probably the most well-known exception to the rule that the volume is generally greater than that of the comparable solid.
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