Abstract
An electrical method of measuring water vapour pressure in small sealed-off valves is described in which the change in voltage drop across a glow discharge in the vapour is studied as the envelope is cooled. The method was developed primarily for measuring the partial pressure of water vapour in argon-water vapour mixtures in Radar TR switches, but the application to other cases is discussed. Results are repeatable and are rapidly obtained. Vapour pressures of water as low as 0.5 mm. and quantities as small as 0.1 μg. can be estimated.
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