Saturation Vapor Pressure(redirected from Saturation vapour pressure)
saturation vapor pressure[‚sach·ə′rā·shən ′vā·pər ‚presh·ər]
Saturation Vapor Pressure
in meteorology, the maximum possible vapor pressure at a given temperature. The higher the air temperature, the greater the saturation vapor pressure. The condensation of water vapor begins after the saturation vapor pressure is reached. The saturation vapor pressure is greater over supercooled water than over ice at the same temperature; it is greater over a convex water surface and smaller over a concave water surface than over a plane water surface. At a temperature of 30°C the saturation vapor pressure does not exceed 42.4 millibars; at 0°C it is 6.1 millibars, and at – 20°C it is equal to 1.27 millibars over water and 1.03 millibars over ice (1 millibar = 102 newtons per m2).