Define viscosity, diffusion and vapour pressure.
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Vapour pressure or equilibrium vapour pressure is defined as the pressure exerted by a vapour in thermodynamic equilibrium with its condensed phases (solid or liquid) at a given temperature in a closed system.
The equilibrium vapour pressure is an indication of a liquid's evaporation rate.
Viscosity is usually the property of a fluid which opposes the relative motion between two surfaces of the fluid that are moving at different velocities.
Thereby, viscosity means friction between the molecules of fluid.
Diffusion is the movement of a fluid from an area of higher concentration to an area of lower concentration.
Diffusion is a result of the kinetic properties of particles of matter.
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