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## Isobaric process
## Additional recommended knowledge
According to the first law of thermodynamics, where but since pressure is constant, this means that - .
Applying the ideal gas law, this becomes assuming that the quantity of gas stays constant (e.g. no phase change during a chemical reaction). Since it is generally true that then substituting the last two equations into the first equation produces: - .
The quantity in parentheses is equivalent to the molar specific heat for constant pressure: *c*_{p}=*c*_{V}+*R*
and if the gas involved in the isobaric process is monatomic then and . An isobaric process is shown on a P-V diagram as a straight horizontal line, connecting the initial and final thermostatic states. If the process moves towards the right, then it is an expansion. If the process moves towards the left, then it is a compression. ## Defining EnthalpyAn isochoric process is described by the equation The quantity - .
## See also- Adiabatic process
- Cyclic process
- Isochoric process
- Isothermal process
- Polytropic process
- Isoenthalpic process
Categories: Thermodynamic processes | Atmospheric thermodynamics |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isobaric_process". A list of authors is available in Wikipedia. |