This is the energy stored during a material phase change. It is key to the Phase Change Materials (PCMs) value. Temperature change does not occur while a pure phase change material is undergoing a phase change. Temperature stays isothermal (constant temperature), and the PCM absorbs and releases a large amount of energy. An inverse process occurs during which a PCM releases thermal energy as it solidifies (freezes) which helps to protect against low temperatures during its phase change. (ISTA)
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