The only difference between the two vessels is that the piston at the top of A is fixed, whereas the one at the top of B is free to move against a constant external pressure p. We now consider what ha...The only difference between the two vessels is that the piston at the top of A is fixed, whereas the one at the top of B is free to move against a constant external pressure p. We now consider what happens when the temperature of the gas in each vessel is slowly increased to \(T + dT\) with the addition of heat. In this case, the heat is added at constant pressure, and we write \[dQ = C_{p}ndT,\] where \(C_p\) is the molar heat capacity at constant pressure of the gas.
The only difference between the two vessels is that the piston at the top of A is fixed, whereas the one at the top of B is free to move against a constant external pressure p. We now consider what ha...The only difference between the two vessels is that the piston at the top of A is fixed, whereas the one at the top of B is free to move against a constant external pressure p. We now consider what happens when the temperature of the gas in each vessel is slowly increased to \(T + dT\) with the addition of heat. In this case, the heat is added at constant pressure, and we write \[dQ = C_{p}ndT,\] where \(C_p\) is the molar heat capacity at constant pressure of the gas.
