Final answer:
Expanding gases can generate an increase in pressure.
Step-by-step explanation:
Expanding gases can generate an increase in pressure. This occurs because when gases are heated, their particles gain kinetic energy and move faster, colliding with the walls of their container more frequently and with greater force. This increase in collisions results in a higher pressure. For example, when gas is trapped inside a sealed container and heated, the molecules move faster and hit the walls of the container more frequently, causing the pressure inside to increase.