What is the kinetic theory of gases?

(N/A) The kinetic theory of gases is a theoretical model that describes the macroscopic properties of gases (such as pressure,temperature,and volume) by considering their molecular composition and motion.
It is based on the following fundamental assumptions:
$1$. $A$ gas consists of a large number of identical particles (atoms or molecules) that are in constant,random motion.
$2$. The volume occupied by the gas particles themselves is negligible compared to the total volume of the container.
$3$. The particles exert no forces on each other except during elastic collisions.
$4$. All collisions between particles or with the walls of the container are perfectly elastic,meaning kinetic energy is conserved.
$5$. The average kinetic energy of the particles is directly proportional to the absolute temperature of the gas.