Variable Density Viewpoint
A given quantity (mass m) of gas in a changing volume produces a change in density ρ. In this context the ideal gas law is written
- R(T ρ) = M P
where T is thermodynamic temperature. When R and M are taken as constant, then pressure P can stay constant as the density-temperature quadrant (ρ,T ) undergoes a squeeze mapping.
Read more about this topic: Isobaric Process
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—Edmund Spenser (1552?–1599)