This process is called evaporation when water gets heated up to a high temperature and water is converted to gas form and goes forming into a cloud. If this process happens under a ceiling or roof the gas will hit the top and reconvert back to water and float back to original source with 0.73% less water. The gas loses 0.73% of water when hits top of ceiling. This water floats around a bit and eventually we breath it! Ever felt as though you are breathing oddly and heavy? This is it! Hope I helped!
