The following are the main assumptions of the Kinetic Molecular Theory of gases: 1. Gases are made up of molecules which are relatively far apart. 2. The molecules are in motion at high speeds. 3. The molecules are perfectly elastic. 4. Increase in temperature increases the kinetic energy of the molecules. The assumption that explains Charles's Law is: 3 4 1 2

The assumption that explains Charles's Law is:<br /><br />4. Increase in temperature increases the kinetic energy of the molecules.<br /><br />Charles's Law states that the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure is held constant. As the temperature increases, the kinetic energy of the gas molecules increases, causing them to move more rapidly and occupy a larger volume.