Question

Explain from a molecular view, why under constant pressure, when the temperature of an ideal gas increases, the volume also increases

Answer 1

Increasing the temperature of a volume of gas causes individual gas molecules to move faster. As the molecules move faster, they encounter the walls of the container more often and with more force.That's why when the pressure is constant the volume goes on increasing with increase in temperature because the internal pressure becomes higher than external and to maintain equilibrium volume increases. Charles’ Law is the formal description of this relationship, allowing change in volume to be calculated if the temperature change is known.