Psychrometrics

Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening due to condensation. As the exposed surface cools by radiating its heat, atmospheric moisture condenses at a rate greater than that at which it can evaporate, resulting in the formation of water droplets.

thumb|upright=1.35|A patch of grass showing three zones.

gaseous phase of water; unlike other forms of water, water vapor is invisible

temperature at which air becomes saturated with water vapour

thumb|A misty autumn morning in the outskirts of Rakhiv, [[Carpathian Biosphere Reserve, Ukraine]] thumb|The Château de Chambord in France, in mist Mist is a natural phenomenon caused by small droplets of water aerosols suspended in the cold air, usually by condensation. Physically, it is an example of a dispersion, most commonly seen where water vapor in warm, moist air meets sudden cooling, such as in exhaled air in the winter, or when hot sauna steam is suddenly released outside. Mist occurs naturally as part of weather, typically when humid air comes into contact with surfaces that are muc

thumb|A hair tension dial hygrometer with a nonlinear scale.

thumb|Harmattan Haze in [[Abuja]] thumb|right|Haze over the Mojave Desert from a [[brush fire in Santa Barbara, California, seen as the Sun descends on the 2016 June solstice, allows the Sun to be photographed without a filter.]] thumb|Haze as smoke pollution over the Mojave from fires in the Inland Empire, June 2016, demonstrates the loss of contrast to the [[Sun, and the landscape in general.]]

ground-level cloud of ice crystals

device that cools air through the evaporation of water

Psychrometrics (or psychrometry, ; also called hygrometry) is the field of engineering concerned with the physical and thermodynamic properties of gas-vapor mixtures.

thumb|Humidor with hygrometer and bowl of water during initial seasoning thumb|Humidor with cigars

any material used to resist diffusion of moisture through walls, floors, ceilings, or roofs

Difference between moisture in air and moisture capacity

measure of the passage of water vapor through a substance