Description: The vapor pressure of rubidium was experimentally determined from 1400 deg F up to its critical temperature. An empirical equation of the form ln P = A + B/T + C ln T + DT/sup m/ fit the data well when m = --2. A critical pressure of 1942.9 plus or minus 3.5 psia (132.2 plus or minus 0.24 ata) was measured. The corresponding critical temperature, extrapolated from the pressure-- temperature curve, agrees with 3790.7 plus or minus 10 deg R (2106 plus or minus 5 deg K) of Chung and Bonilla, which was adopted. The technique employed was the pressure tube method developed earlier in this laboratory and used for determining the vapor pressure of cesium. This method messures the critical pressure directly, as well as the vapor pressure at lower temperatures. (3 tables) (auth)
Date: January 1, 1973
Creator: Bhise, V.S. & Bonilla, C.F.
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