niiske õhu veeauru moolosa suhe %-s samal rõhul ja temperatuuril küllastunud veauru moolosasse (vt õhuniiskus)
the ratio in % of the mole fraction of water vapor in moist air to the mole fraction of water vapor, that the moist air would have if it were saturated with respect to ice at the same pressure and temperature (see: humidity)
