Liquidmdash;vapor equilibrium phase compositions for the binary system normal hydrogenmdash;helium have been determined for 11 isotherms in the range 15.50deg;mdash;32.50deg;K and at pressures up to 500 psia. The vapor recirculation method of obtaining equilibrium was used in conjunction with a liquid hydrogen vapormdash;pressure controlled cryostat. Analyses were made on a mass spectrograph. The results are presented in both tabular and graphical form, and the general behavior of the system discussed. An agreement with some previous investigations is demonstrated, and conflicts in existing data are resolved. Some problems of theoretical correlation of the data are discussed.
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