(h, ln (P)) chart of a gas

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gasHP_chart.png Identification of the main areas and curves of the chart
The (h, ln (P)) chart of an ideal gas has a single zone corresponding to the gaseous state.

In this chart, is indicated on the abscissa, and on the ordinate, most often on a logarithmic scale, so that the zone corresponding to the low pressures is more readable.

The curves in blue are the , the curves in red are the , and the curves in green are the .

It will be noted that the isotherms are due to the fact that is independent of the pressure.