As energy in the form of heat is added to a solid, its molecules begin to vibrate more rapidly until they break out of their fixed positions and the solid becomes a liquid.
The change from solid to liquid is called melting and occurs at a definite temperature, the melting point. The molecules of a liquid are free to move throughout the liquid but are held from escaping from the liquid by intermolecular forces. This gives a liquid a definite volume but no definite shape.
Matt: WRONG
Record: 146-125
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