The potential energy of the particles increases as intermolecular forces are overcome.
When a substance such as ice melts, its temperature increases. Water molecules become less orderly and they spread apart.
"Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors." An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as the result of its position.
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