An open vertical tube of diameter \(5 \mathrm{~mm}\) and height \(100 \mathrm{~mm}\) (above water at \(27^{\circ} \mathrm{C}\) ) is exposed to ambient air at \(27^{\circ} \mathrm{C}\) and \(25 \%\) relative humidity. Determine the evaporation rate, assuming that only mass diffusion occurs. Determine the evaporation rate, considering bulk motion.