What does "thermal expansion" mean in plumbing?

Thermal expansion in plumbing refers to the phenomenon where materials change in volume in response to temperature changes. When water is heated, it expands, meaning its volume increases. This is significant in plumbing because heated water will take up more space than when it is at a colder temperature, which can impact the design and function of plumbing systems.

Understanding thermal expansion is crucial for preventing issues such as excessive pressure in pipes, which can occur if there is not enough room for the water to expand as it is heated. This is a vital consideration for maintaining the integrity and functionality of the plumbing system. Thus, the increase in water volume as it heats up is the correct interpretation of thermal expansion in the context of plumbing.