Question

When you raise the temperature of air, the molecules move farther apart from each other. This lowers the density of the warm air. What will happen to this warm air? (In an ideal gas, increasing the temperature of the gas also increases its volume.)

Answer 1

The warm air will expand. If it is in a container, the pressure the air exerts on the containers walls will increase.

To experiment and prove this, put a plastic ziploc bag of air in the microwave sealed. The air will expanded and blow the zip open