PrepZii

table

Processes, Sign Convention and First Law

Thermodynamics begins with process definitions, the IUPAC sign convention, and the first law.

\Delta U=(U_2-U_1)=q+w

Process	Condition
Isothermal	$T=\text{constant}$ ; $dT=0$ ; $\Delta T=0$
Isochoric	$V=\text{constant}$ ; $dV=0$ ; $\Delta V=0$
Isobaric	$P=\text{constant}$ ; $dP=0$ ; $\Delta P=0$
Adiabatic	$q=0$ ; heat exchange with surrounding = 0

$\Delta$

change in a thermodynamic quantity