Isobaric Process - Practice Questions & MCQ

Isobaric Process- A Thermodynamic process in which pressure remains constant is known as the isobaric process.

In this process, V and T change keeping P constant.I.e Charle’s law is obeyed in this process

   Key points in the Isobaric Process-

• Its Equation of state is given as

I.e    

• P-V Indicator diagram for an isobaric process

            Its PV graph has slope=0 (i.e )

        

The above Graph represents an isobaric expansion.

 The P-V diagram for this process is a line is parallel to the volume line.

 

• Specific heat of gas during the isobaric process is given by

           

• The bulk modulus of elasticity during the isobaric process is given by

                

• Work done in the isobaric process-

        

        Or we can write

• Internal energy in an isobaric process

           

• Heat in an isobaric process

From FLTD 

So

           So

• Examples of the isobaric process-

               1. Conversion of water into vapour phase (boiling process)   

                From the first law of thermodynamics    

                  

                    since   [as there is no change in temperature]  and using, 

                      

Here, i- initial state and f-finalstate

               2. Conversion of ice into water

                From FLOT        and using, 

               we get   

                             

since   [as there is no change in temperature]

and       [ As  is negligible, I.e, when ice convert into water then change in volume, is negligible]

Hence