Thermodynamic diagrams

Especially in meteorology they are used to analyze the actual state of the atmosphere derived from the measurements of radiosondes, usually obtained with weather balloons.

In such diagrams, temperature and humidity values (represented by the dew point) are displayed with respect to pressure.

Thus the diagram gives at a first glance the actual atmospheric stratification and vertical water vapor distribution.

By assuming the energy amount due to solar radiation it is possible to predict the 2 m (6.6 ft) temperature, humidity, and wind during the day, the development of the boundary layer of the atmosphere, the occurrence and development of clouds and the conditions for soaring flight during the day.

Not a thermodynamic diagram in a strict sense, since it does not display the energy–area equivalence, is the But due to its simpler construction it is preferred in education.

[1] For more accurate information, the height of the highest point, or the max pressure, to surpass the static friction would be proportional to the frictional coefficient and the slope going back down to the normal pressure would be the same as an isothermal process if the temperature was increased at a slow enough rate.

This is a process where volume is held constant which shows as a vertical line on a P-V diagram.