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Gravitational forces between molecules are comparatively small relative to intermolecular or interatomic forces. Since phase change is controlled by intermolecular forces, the rate of melting or freezing should be the same under microgravity as it is under normal gravity conditions, provided that thermal and solutal fields are the same. However, phase change happens to be indirectly influenced by gravity due to convection in the liquid phase, which propagates nuclei and enhances heat transfer, also changing the thermal contact conductance between the heated (or cooled) wall and the phase change material.
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its
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