According to First law of thermodynamics,
Where ΔQ=heat supplied to the system
ΔU=change in internal energy
ΔW=work done by the system
For an isothermal process ΔT=0, therefore ΔU=0.
When heat is supplied to the system gas expands i.e. the volume of the gas increases.
We know that,
Work done = force ×displacement
Volume = area ×displacement
Work done=pressure ×volume
Let change in the volume of object = ΔV = V2-V1
Thus, work done by the object W
During expansion volume increases. Hence, work done will be positive and equals PV.
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