What do you mean by postulates of kinetic theory of gases?

The postulates of Kinetic Theory was developed in the nineteenth century explaining the behaviour of gases. Kinetic Theory gives:

i) molecular interpretation of pressure and temperature of a gas, and is consistent with gas laws and Avogadro's hypothesis.

ii) explains specific heat capacities of many gases.

iii) relates measurable properties of gases such as viscosity, conduction and disffusion with molecular parameters.

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According to kinetic theory of gases what type of collision the molecules of gases undergo?

According to kinetic theory of gases, do the gas molecules interact due to intermolecular forces?

What type of energy is taken into account while finding the pressure exerted by a gas?

According to kinetic theory of gases, does the number density of gas molecules change with time?