# Saturation Vapor Pressure

(redirected from Saturation vapour pressure)

## saturation vapor pressure

[‚sach·ə′rā·shən ′vā·pər ‚presh·ər]
(thermodynamics)
The vapor pressure of a thermodynamic system, at a given temperature, wherein the vapor of a substance is in equilibrium with a plane surface of that substance's pure liquid or solid phase.

## 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).

References in periodicals archive ?
compared to the saturation vapour pressure over the cold ice ([e.
In contrast, the saturation vapour pressure over the cold nodules was around 1.
Where PET is the potential evapotranspiration (mm/day),[DELTA] is the slop of the saturation vapour pressure temperature curve(mb/[degrees]c),y is the psychrometric constant(mb/[degrees]c),P is the air pressure (mb),E is the elevation of the site(m),[lambda] is the latent heat of evaporation(kj/kg), [T.
Where PET is the potential evapotranspiration (mm/day), A is the slop of the saturation vapour pressure temperature curve (kpa/[degrees]c), [R.
Where PET is the potential evapotranspiration (mm/day), [DELTA] is the slop of the saturation vapour pressure temperature curve(kpa/[degrees]c), [R.
es = saturation vapour pressure [kPa], ea = actual vapour pressure [kPa],
es - ea = saturation vapour pressure deficit [kPa],
s] - saturation vapour pressure at hotplate surface (Pa), [p.
At 56[degrees]C this univariant give a saturation vapour pressure uv = 121,8 torr (16,24 kPa); associated with uvo = 124,6 torr (16,61 kPa).
This consideration invalidates the theoretical relative humidity value reported by Blount & Dickson (1973) (figure 4), based on the saturation vapour pressure at 56[degrees]C: 99,5% for uv = 124 torr.
is saturation vapour pressure, and [gamma] is liquid-phase activity coefficient.
1] is mole fraction of component 1 in the liquid phase, and p* is saturation vapour pressure.

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