Compressibility Data for Helium at 0C AND Pressures at 800 Atmospheres

摘要

Evaluated are the thermodynamic properties of helium and helium-containing mixtures. Twenty-two compressibility runs were made with helium at O C and pressures to 800 atmospheres using a Burnett-type apparatus. Data from the 22 runs were treated simultaneously and as separate runs while different functional forms and weighting factors were used. A fourth-degree-polynomial equation in the pressure gives a statistically satisfactory representation of the compressibility factor when the data are treated simultaneously and a weighting factor is used. The second virial coefficient of helium at O C from this investigation is 11.997cu. cm./mole. The stated uncertainty is the random error standard deviation. Compressibility factors determined by this investigation are precise to better than 0.01 percent and are believed to be accurate to better than 0.02 percent. (Author)