The viscosity of gases and its relationship to the gas laws.

The correlation of the pressure, voiume and temperature of a gas to give an equation, whioh will be valid under all oonditions, is one of the outstanding problems in the study of the kinetic theory of gases. The failure of the ideal gas law when applied to actual gases is well known. Van der Waals has succeeded partially in accounting for the reasons for this failure by taking into consideration the molecular volume and molecular attraction which exist in any one gas. The classical equation of state derived by Van den Waalsis not, howver, of suoh a general form as to be applicable under all conditions. Numerous attempts have been made to develop a general equation of state, but none can be described as entirely successful. In most cases empirical constants have been introduced into the equations which are without theoretical foundation. [...