Which type of pipe is specifically known to expand with heat?

Copper is specifically known for its thermal expansion properties when subjected to heat. This characteristic is crucial for applications where temperature fluctuations are expected, as it allows the pipe to expand and contract without risking structural integrity. In practical terms, when heated, copper pipes can expand significantly, which must be taken into account during installation and design to avoid stress on joints and connections.

For example, if copper pipes are installed too rigidly without consideration for expansion, they can cause leaks or even ruptures in the system. Therefore, when working with copper, pipefitters often incorporate expansion fittings or allow for movement in the installation to accommodate this expansion. This attribute of copper makes it a popular choice in systems that are prone to temperature changes, such as heating systems or in environments where the temperature varies greatly.