A hole is cut in a sheet of room-temperature metal. The sheet is then heated up to a much higher temperature (without melting). What happens to the size of the hole?

A) bigger

B) same size

C) smaller

D) depends

Answer: A. Almost all objects get bigger as their temperature increases. This is because the molecules are moving faster and then have an equilibrium distance from their neighbors that increases. This is true on both the outside edge of the sheet and the ring of molecules around the hole.