Observation


partial vapour pressure becomes equal to the saturation



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partial vapour pressure becomes equal to the saturation
vapour pressure, (es EU) (unit degrees
centigrade)
- Saturation deficit "De": Difference between saturation and
partial water vapour pressure at a given total pressure and
temperature. (De=E-e; unit:mb)
- Mixing ratio "r ratio of the mass of water vapour to the
mass of dry air with which the water vapour is
associated.(unit: g/Kg)
Note: Distinction has to be made between water vapour over
water or ice.
2.2.12 Observation of air humidity
The humidity of the air should be measured in representative
placed at different levels in the air layer adjacent to the
soil (from ground level up tom. Observations taken for
special research projects will vary with the needs of the
problems Under investigation. !
2.2.2 Instruments
2.2.21 Methods of measurement

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