Observation

- methods using the change in dimensions of hygroscopic

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meteorological elements

- methods using the change in dimensions of hygroscopic
- substances (hair hygrometers.
- Thermpdynamic methods (psycrometer).
Dry and wet bulb temperatures allow the calculation of the
air humidity ,
- The absorption method uses the change of electrical
resistance or capacity in chemically treated sensors.
- condensation method (dew and frost point hygrometers.

2.2.22 Water vapour sensors
2.2.221 Mechanical hygrometers
- Mechanical hygrometers and hygrographs. The change in length of hygroscopically sensitive hairs is used to construct "mechanical" hygrometers and hygrographs

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