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Question
In which process, the net work done is zero?
In which process, the net work done is zero?
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Solution
The correct options are
B Free expansion
C Isochoric
In terms of thermodynamics, work done is a function of pressure and volume.
- In free expansion there is no work done as there is no
external pressure. That's certainly true, in fact free expansion is an
irreversible process in which a gas expands into an insulated evacuated chamber,
you can think of it like a container with a piston and the gas is left to
expand in vacuum.
- An isochoric process is one in which the volume is held
constant (V=constant), meaning that the work done by the system will be zero.
It follows that, for the simple system of two dimensions, any heat energy
transferred to the system externally will be absorbed as internal energy.
B Free expansion
C Isochoric
In terms of thermodynamics, work done is a function of pressure and volume.
- In free expansion there is no work done as there is no
external pressure. That's certainly true, in fact free expansion is an
irreversible process in which a gas expands into an insulated evacuated chamber,
you can think of it like a container with a piston and the gas is left to
expand in vacuum.
- An isochoric process is one in which the volume is held constant (V=constant), meaning that the work done by the system will be zero. It follows that, for the simple system of two dimensions, any heat energy transferred to the system externally will be absorbed as internal energy.
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