Elastic collision, a collision in which the total translational kinetic energy of the molecules is conserved.The size of the molecules is negligible d
The gas consists of molecules of mass m in ceaseless random motion. kinetic model, a model of a gas in which the only contribution to the energy is from the kinetic energies of the molecules. effusion, the emergence of a gas from a container through a small hole. viscosity, the migration of linear momentum down a velocity gradient. electric conduction, the migration of electric charge along an electrical potential gradient. thermal conduction, the migration of energy down a temperature gradient. diffusion, the migration of matter down a concentration gradient. transport property, the ability of a substance to transfer matter, energy, or some other property from one place to another. 
Atkins & de Paula: Atkins’ Physical Chemistry 9e Chapter 20: Molecules in Motion
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