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Most probable speed: It is the speed possessed by maximum number of gas molecules at a given temperature.
Compressibility factor (Z): It is the ratio of observed volume of a gas to the calculated volume under given conditions of temperature and pressure of the gas.
Critical temperature: The temperature above which a gas cannot be liquefied no matter how much pressure is applied.
Critical pressure: Pressure exerted by gas at critical temperature.
Critical volume: Volume attained by gas at critical temperature and pressure.
Vapour pressure: It is the pressure exerted by a vapour when vapour is in equilibrium with the liquid or solid form or both.
Boiling point: The temperature at which the vapour pressure of a liquid becomes equal to the atmospheric pressure.
Freezing point: The temperature at which the vapour pressure of a liquid becomes equal to the vapour pressure of the solid.
Surface tension: It is the tendency of a fluid surface to occupy the smallest possible area.
Viscosity: It is the property of liquids which determines their resistance to flow.
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