Abstract
Tests have been conducted on a 0·057 m3 (2 ft3) holder taken out of normal service and specially instrumented. The effects of water sealant temperature changes and evaporation on the volumetric readings of the holder have been measured. From these results, the mass transfer coefficient k, which is a measure of the rate of evaporation, has been evaluated.
It is concluded that well-maintained holders, whether used for pressure or vacuum testing, give rise to insignificant errors in volume measurement under normal test conditions, such as those specified in B.S. 4161, in a room with reasonable temperature control. Only when a holder is used to measure low flow rates do evaporative effects give rise to substantial errors.
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