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SummaryAfter describing simplified equations expressing the temperature dependency of the viscosity of carrier gases (helium, nitrogen and hydrogen) relative to a base value, absolute relationships based on the kinetic theory of gases are discussed. Comparative data obtained using various calculation methods are given and are compared to measured values. Based on the kinetic relationships, simplified equations are suggested to describe the temperature relationship of viscosity. Finally, the influence of pressure on the viscosity is also briefly discussed. As a supplement, viscosity data are tabulated for the three gases in the range of 0 "C to 400 "C in increments of 2 K , calculated using the kinetic relationships.