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a phase-change material (pcm) is a substance with a high heat of fusion which, melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy. heat is absorbed or released when the material changes from solid to liquid and vice versa; thus, pcms are classified as latent heat storage (lhs) units. 

phase change materials are useful for cooling a wide range of products and their application varies.  in this technology review, we review two applications of phase change materials: two for cooling batteries and one for a heat sink with a cavity filled with phase change material. 

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