# Isobaric Process - Entropy

on . Posted in Thermodynamics

### Isobaric process - entropy Formula

$$S = \Delta S \; C_p \; [ \; ln \; ( T_f \;/\; T_i ) \; ]$$
Symbol English Metric
$$S$$ = entropy $$Btu \;/\; lbm-R$$ $$kJ \;/\; kg-K$$
$$\Delta S$$ = change in entropy $$Btu \;/\; lbm-R$$ $$kJ \;/\; kg-K$$
$$C_p$$ = heat capacity at constant pressure $$Btu \;/\; R$$ $$kJ \;/\; K$$
$$ln$$ = natural logarithm $$dimensionless$$
$$T_f$$ = final temperature $$R$$ $$K$$
$$T_i$$ = initial temperature $$R$$ $$K$$

### Isobaric process - entropy Formula

$$S = \Delta S \; ( n\; C_v) \; [ \; ln \; ( T_f \;/\; T_i ) \; ]$$
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 $$dimensionless$$
$$C_v$$ = heat capacity at constant volume $$Btu \;/\; R$$ $$kJ \;/\; K$$
$$ln$$ = natural logarithm $$dimensionless$$
$$T_f$$ = final temperature $$R$$ $$K$$
$$T_i$$ = initial temperature $$R$$ $$K$$