Expand Contract For Free

Expansion is due to an increase in the average distance between atoms (or molecules) in the substance. The atoms themselves do not expand - they just move further away from their neighbours. Contraction is due to an decrease in the average distance between atoms (or molecules) in the substance.

Solids expand when they are heated and contract when they are cooled. So do liquids. It probably won't surprise you that gases act the same way. Gases also expand when they are heated and contract when they are cooled.

Parallel change, also known as expand and contract, is a pattern to implement backward-incompatible changes to an interface in a safe manner, by breaking the change into three distinct phases: expand, migrate, and contract.

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.

Clay tends to expand and contract with the temperature, and it also expands and contracts in response to moisture. This movement of the ground can cause a home to sink too far, or it can put pressure on the foundation from below and cause cracking.

Liquid water contracts when cooled, and you would expect that it continues to contract as it gets colder. When it hits freezing and turns into a solid, it expands. That's why water pipes may burst when the water inside freezes over. Ice takes up more space than liquid water.