Why does a solid change to liquid on heating?

A solid changes into liquid by the process of melting. When the solid is heated, its temperature increases. The kinetic energy of its particles will also increase and they will start vibrating about their positions. The forces of attraction between particles is overcome by the heat, the particles leave their position and start moving about randomly. At this stage the solid melts and gets converted to liquid.

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when a solid is heated, its particles starts to move more rapidly, that is, their kinetic energy increases. then, a point comes when the temperature reaches so high that all the bonds between the particles of the solid breaks and the solid changes into a liquid.

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a solid change into liquid by melting
 
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Due to melting.
 
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When a solid is heated, the particles are given more energy and start to vibrate faster. At a certain temperature, the particles vibrate so much that their ordered structure breaks down. At this point the solid melts into liquid.
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A solid change into liquid by MELTING
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