Humidity Humidity Humidity is the amount of water vapour present in air. Water vapour, the gaseous state of water, is generally invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present. The amount of water vapour needed to achieve saturation increases as the temperature increases. As the temperature of a parcel of air decreases it will eventually reach the saturation point without adding or losing water mass. The amount of water vapour contained within a parcel of air can vary significantly. For example, a parcel of air near saturation may contain 28 grams of
Nonresidential water use in the U.S. was 15,900 mgd. The amount purchased from public systems was reported to be 4,750 mgd in 1995 (or about 40 percent of total CII use). Based on the total floor space of 11,100 million square feet in manufacturing buildings in the U.S. and assuming average use of 215 g/ksf/d, the total use of publicly-supplied water by the CII manufacturing category in the U.S. would be about 2,400 mgd or about 20 percent of the total CII use. Nonresidential water use in the U.S. Nonresidential water use refers to all uses (and users) of publicly-supplied (municipal) water other than residential use.