1. Adiabatic cooling formula.
If the wet bulb psychrometer comes out adiabatic change, the following formula has to be given strictly.
And if the partial pressure and the temperature are used as an orthogonal coordinate in humidity chart, then the adiabatic change shows almost a straight line, and this chart is convenient for a practical use. (fig. 1 & 5)
2. Error due to radiation to the wet bulb.
This error is calculated theoretically, and is compared with the Carrier-Lindsay chart.
(fig. 3)
3. A formula on the wet bulb psychrometer,
The moisture, which is diffused from the wet bulb surface, carries heat quantity against the main heat flow, and so the following formula is given theoretically.
This formula equals approximately to the well-known formula.