We know that all materials are made of atoms, in a solid state these atoms attract each other and are locked together by the inter-molecular forces between them. But, even in a solid state the atoms are not completely still; they still vibrate on a fixed position.
If these
atoms are given more internal (kinetic) energy, the particles vibrate faster
and further, if the temperature continues to increase to a point where the
inter-molecular forces between particles are not strong enough to hold the
structure together, but are strong enough to prevent the atoms from flying
apart from each other; a liquid is born. This process of going from a solid
state to a liquid is called melting or fusion.
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