In isochoric thermodynamic process, the volume of the system does not change. An example of such a process is gas inside a closed container. The work done by such a system is zero. However, if the system is heated, there will be changes in the internal energy of the system.
According to the first law of thermodynamics,
ΔQ = ΔU + W,
Where Q = heat transferred
and ΔU = change in internal energy.
Therefore, ΔQ = ΔU.
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