i Meltingliquidificationfusion involves heating a solid to weaken the strong bonds holding the solid particles together Solids are made up of very strong bonds holding the particles very close to each other Kinetic Theory of matterOn heating these particles gain energyheat from the surrounding heat source to form a liquid with weaker bonds holding the particles close together but with some degree of freedom Meltingfreezingfusion is an endothermic Hprocess that requireabsorb energy from the surrounding