The term ‘Isobaric’ derives from
the Greek isos(equal), and barus(heavy).
An isobaric process is a thermodynamic process, in which the pressure of the working system remains/maintained/kept constant throughout the process.
In an isobaric process, dP=0. Hence,
V/T is constant in an isobaric process.
W = PdV = PΔV = nRΔT(where n is number of moles)
In an isobaric process, there are typically internal energy
changes, work is done by the system,
and heat is transferred, so none of the quantities in the first law of thermodynamics readily
reduce to zero.
This
is usually obtained by allowed the volume to expand or contract in such a way
to neutralize any pressure changes that would be caused by heat transfer
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