Gases consist of large numbers of tiny particles that are far apart relative to their size.
Collisions between gas particles and between particles and container walls are elastic collisions (there is no net loss of total kinetic energy).
Gas particles are continuous, rapid, random motion. They therefore possess kinetic energy, which is energy of motion.
There are no forces of attraction between gas particles.
The temperature of a gas depends on the average kinetic energy of the particles of the gas.
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