Answer :
When the potential energy increases molecules change phases.
In a solid, intermolecular interactions prevent atoms, ions, or molecules from moving from their average positions and lock them into an ordered, long-range lattice structure. This structure disintegrates in a liquid, where molecules can still be attracted to one another while slipping past one another. These attraction forces are overcome in a gas, and the substance expands to fill the space as a result of each particle's increased mobility and ability to separate from the others.
Substances can be transformed from one phase into another. Solids melt into liquids and liquids boil to form vapors at temperatures that depend on their molecular properties, so chemists are interested in these transitions between phases. We are all familiar with the changes in macroscopic properties that accompany these transitions. This method is well-known. The liquid that results from the solid melting can flow and takes on the shape of the container. This transition can only occur with the help of heat from a flame. On a microscopic level, melting entails dissolving the intermolecular bonds that hold molecules together. An increase in the molecules' potential energy is necessary for this.
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