The application of heat to a solid causes it to expand also but to a much smaller degree than a gas. In a metal rod every unit length of the rod becomes longer when it expands. The increase in length for each unit of length per degree rise in temperature is called the coefficient of linear expansion. Liquids in general behave like solids and expand slightly when the temperature is raised. The Transfer of Heat Heat transfer helps to shape the world in which we live.
Great loss is suffered by man when heat transfer is impossible.
If a way could be found to transfer heat to the polar regions they could support large populations just as the temperate countries do. Fortunately man has been more successful in making use of the natural methods of heat transfer on a smaller scale. A quantity of heat is useless if it is where it is not needed. It may be useful if it can be moved to another place. Heat, by its very nature, helps to make this possible.