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Define contraction due to cooling.
Contraction due to cooling:
Materials expand or contract when subjected to changes in temperature. Most materials expand when they are heated, and contract when they are cooled. This happens because all materials are made up of atoms. At any temperature above absolute zero (-273 degrees Celsius), the atoms will move. In a solid, they will vibrate in fixed positions, in a liquid they will move past each other and in a gas they will move at a very high speed. When a material is heated, the kinetic energy of that material increases and its atoms and molecules move about more. This means that each atom will take up more space due to its movement so the material will expand. When it is cold the kinetic energy decreases, so the atoms take up less space and hence, the material contracts.
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