The increase in volume of a substance due to an increase in temperature is called thermal expansion.

There are two types of thermal expansion:

* Linear expansion: The change in length of a solid object due to a change in temperature.

* Volume expansion: The change in volume of a substance (solid, liquid, or gas) due to a change in temperature.

It's important to remember that different materials expand at different rates. For example, steel expands more than concrete when heated.