A liquid can exist only,

Solid, gas, plasma, and liquid are the four fundamental states of matter. A liquid is a type of fluid that changes shape depending on the shape of the container it is in, but does not change volume whether pressure is applied or not. It is made up of tiny vibrating atoms held together by intermolecular bonds. Liquids have stronger intermolecular forces than gases but weaker than solids.

The triple point is the temperature and pressure at which the solid, liquid, and gaseous phases of a particular substance coexist in equilibrium.

The critical point is defined as the temperature, pressure, and density at which the liquid and gaseous phases of a particular substance become identical.

Melting point: The temperature at which a solid substance transforms into a liquid substance is known as the melting point.

Boiling point: The temperature at which a liquid substance transforms into a gaseous substance is known as the boiling point.

As a result, a liquid can only exist between its boiling and melting points, as above the boiling point it becomes a gas and below the melting point it becomes a solid.