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In thermodynamic processes which of the following statements is not true?
A
In an adiabatic process $PV^\gamma$ = constant
B
In an adiabatic process the system is insulated from the surroundings
C
In an isochoric process pressure remains constant
D
In an isothermal process the temperature remains constant
Detailed Solution
Adiabatic process: no heat is exchanged, so the system is insulated from the surroundings, and for an ideal gas $PV^\gamma$ = constant. Both statements are true.
Isothermal process: the temperature remains constant (true).
Isochoric process: it is the volume that remains constant; the pressure changes with temperature ($P \propto T$).
The process in which pressure remains constant is the isobaric process.
Hence the statement that is not true is 'In an isochoric process pressure remains constant'.
Isothermal process: the temperature remains constant (true).
Isochoric process: it is the volume that remains constant; the pressure changes with temperature ($P \propto T$).
The process in which pressure remains constant is the isobaric process.
Hence the statement that is not true is 'In an isochoric process pressure remains constant'.