isobaric process

An isobaric process is a thermodynamic process in which the pressure stays constant: . The heat transferred to the system does work but also changes the internal energy of the system: According to the first law of thermodynamics, where W is work done by the system, U is internal energy, and Q is heat. Pressure-volume work (by the system) is defined as: (Δ means change over the whole process, it doesn't mean differential) but since pressure is constant, this means that
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