1933 A. 141 450 Values of viscosity are in micropoise.
1941 353 For hydrogen vapour it [sc. the viscosity] is c. 10 micropoise at 14·5° K.
1985 4 269/2 The assumed mean free path of 0.0673 μm for air at sea level and 23°C with viscosity of 183.245 micropoise.