New data for the steady forced vaporization of water has been obtained. Experiments were conducted in five tube bores ringing from 1.9 to 9.5 mm in tube radius at three bath temperatures. The data were normalized and, by applying classical thermodynamic principles to irreversible processes that were conducted steadily, resistances to vaporization were derived. Values of 3.16, 6.06, and 13.7 μmole/sec-mm2 were derived as equipment-independent properties of water in steady forced vaporization at bath temperatures of 50, 25, and 4 deg C, respectively. Convection currents in the liquid were identified as the primary factor that governs steady vaporization by forced means.

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