If we keep the gas in a fixed container at constant pressure and increase the temperature which leads to the increase in its motion.
With an increase in temperature, the particles move faster because they gain kinetic energy which them power to move more faster. If the temperature is decreases again than the motion of gas particles slower down.
The particles of gas again moves slowly due to loss of kinetic energy so we can conclude that increasing the temperature causes in the increase of motion of the gas particles if pressure is constant.
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