Chemical Engineering Help With First Law Of Thermodynamics

1.4 First Law Of Thermodynamics:

 The first law of thermodynamics states that energy can be changed from one form to another but it can neither be created nor destroyed. It conceptualizes the conservation of energy.

The amount of energy added by heating minus the amount lost as a result of the work done by the system on its surroundings is equal to the increase in internal energy.


ΔU = ΔH – ΔW

the work done by gas while expanding,


=> ΔU = ΔH - PΔV

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Types of thermodynamic processes:

  • Isobaric process: occurs at constant pressure.
  • Isochoric process: one in which the volume is held constant and work done is zero.
  • Isothermic process: occurs at a constant temperature.
  • Isoentropic process: occurs at constant entropy.
  • Adiabatic process: process in which there is no energy added or subtracted from the system by heating or cooling.

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