Isentropic thickness chart

From Glossary of Meteorology
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isentropic thickness chart

(Also called thick–thin chart.) A thickness chart of an atmospheric layer bounded by two selected isentropic surfaces (surfaces of constant potential temperature).

The thickness of such a layer is directly proportional to the static instability of that layer; hence, these charts have been called instability charts.
Compare isentropic weight chart;
see isentropic chart.