Six assumptions of kinetic energy theory of gases are:
(a) A gas of a pure material consists of an extremely large number of identical molecules.
(b) The molecules are in constant random motion.
(c) A gas molecule can be treated as an ideal particle.
(d) Intermolecular forces can be ignored.
(e) The collisions are perfectly elastic conserving total momentum and kinetic energy and the duration of a collision is very small as compared to the time interval between successive collisions.
(f) Between successive collisions, a gas molecule travels in a straight line with the constant speed.