Isobaric Process - Entropy in Terms of Pressure and Volume
Isobaric process is a thermodynamic process where the pressure is kept constant, \(\Delta p = 0\).
Isobaric process - entropy in terms of pressure and volume Formula |
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| \( S = \Delta S \; ( - n\; R ) \; [ \; ln \; ( p_f \;/\; p_i ) \; ] \) | ||
| Symbol | English | Metric |
| \( S \) = entropy | \(Btu \;/\; lbm-R\) | \(kJ \;/\;kg-K\) |
| \( \Delta S \) = change in entropy | \(Btu \;/\; lbm-R\) | \(kJ \;/\;kg-K\) |
| \( n \) = number of moles | \(dimensionless\) | |
| \( R \) = molar gas constant | \(lbf-ft \;/\; lbmol-R\) | \(J \;/\; kmol-K\) |
| \( ln \) = natural logarithm | \(dimensionless\) | |
| \( p_f \) = final pressure | \(lbf \;/\; in^2\) | \(Pa\) |
| \( p_i \) = initial pressure | \(lbf \;/\; in^2\) | \(Pa\) |
Isobaric process - entropy in terms of pressure and volume Formula |
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| \( S = \Delta S \; ( n\; R ) \; [ \; ln \; ( V_f \;/\; V_i ) \; ] \) | ||
| Symbol | English | Metric |
| \( S \) = entropy | \(Btu \;/\; lbm-R\) | \(kJ \;/\;kg-K\) |
| \( \Delta S \) = change in entropy | \(Btu \;/\; lbm-R\) | \(kJ \;/\;kg-K\) |
| \( n \) = number of moles | \(dimensionless\) | |
| \( R \) = molar gas constant | \(lbf-ft \;/\; lbmol-R\) | \(J \;/\; kmol-K\) |
| \( ln \) = natural logarithm | \(dimensionless\) | |
| \( V_f \) = final volume | \(in^3\) | \(mm^3\) |
| \(V_i \) = initial volume | \(in^3\) | \(mm^3\) |
