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Phase Transformations

Problem 2.193

Find the mass of all molecules leaving one square centimetre of water surface per second into a saturated water vapour above it at a temperature t2=100∘C.t^{2}=100^{\circ} \mathrm{C} . It is assumed that η=3.6%\eta=3.6 \% of all water vapour molecules falling on the water surface are retained in the liquid phase.

Reveal Answer
μ=ηp0VM/2πRT‾=0.35 g/(s⋅cm2), where p0 is the standard atmospheric pressure\mu=\eta p_{0} V \overline{M / 2 \pi R T}=0.35 \mathrm{~g} /\left(\mathrm{s} \cdot \mathrm{cm}^{2}\right), \text { where } p_{0} \text { is the standard atmospheric pressure}
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