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water content of air in in [M]/[V] units
g water/m3 air |
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water content of air in force/[L]2 units
partial pressure of water vapor in air
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| Saturation Vapor Pressure (es) |
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Definition
maximum water content of air at ambient temperature
vapor pressure above a freely evaporating surface in equilibrium |
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total, integrated water content of a vertical column of the atmosphere (i.e., total water hanging over your head)
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ratio of ambient to maximum air water content
(RH) = ( e / es ) x 100% |
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difference between ambient and maximum air water content
(VPD) = ( es – e ) = es (1 - RH) |
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Temperature that ambient air would be at its maximum water content
T=>Td
e=es
RH = 100%
condensation forms |
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| occurs when ambient = maximum air water content |
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| the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium. |
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Term
| Latent Heat of Vaporization |
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Definition
the amount of energy required for evaporation
λv=2260 kJ energy / kg water
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Term
| Potential Evapotranspiration (PET) |
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Definition
it is the ‘potential’ maximum rate of ET under the given meteorological
conditions if water is unlimited and freely able to ‘jump’ into the atmosphere
PET = (change in pan water depth) x (pan coefficient) |
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Term
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water transferred to earth from the atmosphere
occurs when moist air is cooled to its dewpoint |
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the process by which plants lose water to the
atmosphere
occurs by evaporation from the wet inside of plant leaves
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| pores on the leaf surface where water exits |
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process by which water is discharged from the land/water/vegetation surface
to the atmosphere through the combined processes of evaporation (water and soil and leaf
surfaces) and transpiration (leaf interior)
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| precipitation stuck to leaves |
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