Answer: It's kinetic energy must overcome the inter molecular forces among the liquid particles.
Explanation: Kinetic energy is the energy caused due to motion of the particle.
In liquid phase , there are infinite number of particles when the temperature is given, they would escape the liquid phase overcoming the inter molecular forces and would moves towards the space.
If its kinetic energy must be equal to the average kinetic energy then would never to be able to escape the liquid phase as it wont be able to overcome the inter molecular phases.
It must be moving toward the interior of the liquid when the inter molecular forces are more stronger than the kinetic energy as in that case, high temperature is required in order to decrease the inter molecular forces.
