Which is a postulate of the kinetic molecular theory of gases? Despite being very small, the volume occupied by the individual particles that compose a gas cannot be assumed to be negligible. The volume occupied by the individual particles that compose a gas is very small. However, the distances between gas particles are comparable to the sizes of the gas particles, so the volume occupied by the individual gas particles cannot be assumed to be negligible. The particles that compose a gas are so small compared to the distances between them that the volume of the individual particles can be assumed to be negligible. Because the distances between gas particles are so small relative to the sizes of the gas particles themselves, the volume of the individual particles can be assumed to be negligible.