Compressibility of Gases at High Temperatures. III. The Second Virial Coefficient of Helium in the Temperature Range 600°C to 1200°C

An apparatus is described for measuring the second virial coefficient of gases up to 1200°C. The method of measurement is based on a modification of an expansion method described previously. Results of measurements of the second virial coefficient of helium at 600°, 800°, 1000°, and 1200° are given.