Here's why:
* Kinetic Energy and Temperature: Kinetic energy is directly proportional to temperature. This means that at the same temperature, molecules in both liquids and gases have the same average kinetic energy.
* Intermolecular Forces: The key difference lies in the strength of intermolecular forces. Liquids have stronger intermolecular forces than gases. These forces restrict the movement of liquid molecules, causing them to have lower kinetic energy than gas molecules at the same temperature.
In simpler terms:
Imagine gas molecules as tiny, energetic marbles bouncing around freely. Liquid molecules are like those marbles, but they're also stuck together with glue (the intermolecular forces). Even though they're vibrating and moving, they can't move as freely as the gas molecules.
Therefore, while the average kinetic energy of liquid and gas molecules at the same temperature is the same, the individual molecules in the liquid have a lower kinetic energy due to the stronger intermolecular forces.
