โ Scribed by A. Michels; T. Wassenaar; Th.N. Zwietering
No coin nor oath required. For personal study only.
The vapour pressure of liquid krypton has been measured between triple point and critical point. The results are represented here as a function of temperature by the formula log P = A/T + B log T + CT + D.
fi I., Introductiorl. The vapour pressure of liquid krypton has been measured between 0.7 and 54 atm, covering a temperature range from -157ยฐC to -64ยฐC. The method and apparatus used have been described in previous papers ') ').
Part of the krypton was placed at our disposal by Philips, Eindhoven, another part by the British Oxygen Company, London. It was stated to be pure except for traces of xenon. Therefore it was fractionated in the way described earlier l), until the vapour pressure at constant temperature did not change more than 1 mm of Hg during fractionation.
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Isothermal vapour-liquid data were measured for the krypton-xenon system at ten temperatures between 165 and 270K and pressures to 6.7 MPa, using a vapour recirculating technique. The mixture critical line has been located in (P, T, x) space. Barker's method of data reduction has been used to test t
## ยดลฝ . New vapour pressure data for cyclopropane c-C H were obtained in the temperature 3 6 range from 170 K to 225 K. The experimental data were fitted with an equation of the type . . 2 2 ลฝ . ลฝ . ลฝ . ลฝ . ลฝ . ln prkPa s A q Br TrK q C TrK q D T rK , yielding A s 3.70 " 2.13 , B s . y2 . y4 ลฝ . ลฝ
## Synopsis The vapour pressure of liquid nitrogen has been measured between -176ยฐC and -148ยฐC. The results are represented as a function of temperature by a formula, containing four constants.