Adiabateksponenten

Adiabateksponenten(symbol γ {\displaystyle \gamma } ) er en dimensionsløs kvotient, der beskriver forholdet m

Adiabateksponenten

Adiabateksponenten(symbol ) er en dimensionsløs kvotient, der beskriver forholdet mellem et stofs varmefylde ved konstant tryk (symbol ) og ved konstant volumen (symbol ). Adiabateksponenten er altså givet ved:

Da varmekapacitet (symbol ) blot er varmefylde gange masse, kan man dog også skrive:

En termodynamisk proces, en ekspansion eller en kompression af en idealgas, der ikke inkluderer varmeudveksling, kaldes for en adiabatisk proces. Her gælder det, at tryk (symbol ) gange volumen (symbol ) opløftet i adiabateksponenten er bevaret. Hvis processen går fra tilstanden 1 til tilstand 2 har man altså:

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