A New Technique for the Determination of Heats of Sublimation of Slightly Volatile Substances

Open Access

1 July 1949

journal article
research article
Published by AIP Publishing in Review of Scientific Instruments

Vol. 20 (7) , 504-507
https://doi.org/10.1063/1.1741582

Abstract

A technique is described which enables one to measure relative vapor pressures by measuring the rate of change of transmissivity of thin deposits as they are formed by condensation from the vapor. From the temperature dependence of this rate the heat of sublimation of slightly volatile substances can be determined. In the case of graphite, deposits of the order of 0.1 μg per cm² can be detected.

Keywords

HEAT OF SUBLIMATION
CONDENSATION
PRESSURE MEASUREMENT
VAPOR PRESSURE
VOLATILITY
RATE OF CHANGE
VAPORS