The particles of the gas move faster when you apply heat to a sample of gas.
WHAT IS A GAS?
A gas is one of the three states which matter can exist. A gas posseses no fixed shape or volume.
A gas is characterized by the ability to diffuse quickly through space because of the very weak attraction of its particles to one another.
WHAT DOES HEAT DO?
Heat (thermal energy) increases the kinetic energy i.e. energy due to motion of the particles, causing them to move faster. In the process, gas particles expands.
Therefore, when heat is applied to a sample of gas, the particles of the gas move faster.
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