Answer:
Five Postulates of KMT.
Gas particles travel in straight lines unless they collide with other particles or the walls of the container.
Gas particles have negligible volume compared to the free space between them..
Molecular collisions are perfectly elastic and kinetic energy is conserved.
Gas particles experience negligible intermolecular forces, there are no attractive or repulsive forces between particles.
The average kinetic energy of the particles in a sample of gas is proportional to the absolute temperature.
The fifth postulate is very important to note as it relates kinetic energy to temperature.
For a gaseous particle most of the kinetic energy is in translation.