Comparison of pressures at 300 K and liquid helium temperatures using a clamp‐type bomb

Autor:	Kuong Hoo, W. M. Becker, P.G. Winchell
Rok vydání:	1976
Předmět:	Materials science True vapor pressure law Liquid helium Vapor pressure Compressed fluid Differential thermal analysis Vapour pressure of water Thermodynamics Crystallization Instrumentation Thermal expansion law.invention
Zdroj:	Review of Scientific Instruments. 47:587-591
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1134693
Popis:	A series of measurements in a clamp‐type bomb which relates the pressure at 300 K to the pressure at liquid helium temperatures is described. Below a minimum applied pressure P (300 K), the pressure falls to zero at low temperatures, in agreement with previous observations. Above this pressure, the pressure is found to be a linearly decreasing function of P (300 K). Differential thermal analysis results are given which indicate crystallization rather than a glass transformation for the pressure transmitting medium, a 1:1 mixture of kerosene and mineral oil. A calculation based on known thermodynamic properties of similar organic materials indicates that the observed pressure change is basically due to the pressure dependence of the thermal expansion of the organic fluid mixture.
Databáze:	OpenAIRE
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