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The expansion (or contraction) of any material is due to the kinetic energy of its atoms. When a material is heated, the increase in energy causes the atoms and molecules to move more and to take up more space? that is, to expand. This is true of even a solid such as a metal.

The most common reason for a house to make noises is temperature changes in the air, or what is known as thermal expansion and contraction. The temperature changes cause the wood, metal and other materials in the house structure to expand and contract, resulting in ominous creaks.

Most matter expands when heated and contracts when cooled, a principle called thermal expansion. The average kinetic energy of the particles increases when matter is heated and this increase in motion increases the average distance between its atoms.

Materials expand or contract when subjected to changes in temperature. Most materials expand when they are heated, and contract when they are cooled. When free to deform, concrete will expand or contract due to fluctuations in temperature.

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As the substances are heated up they get bigger and expand in sizes. The liquid, gases and solid expansions occur when it is heated up. Things shrink when they get cold. If the things expand with the addition of the heat it makes sense that they contract when the heat is removed.

When water freezes, it's particles contract (when being frozen), and then slightly expand. However, when water is boiled, it's particles expand quickly depending on the temperature. A liquid, when heated, will expand and can be made to rise up a tube.