A EXPERIENCED PHYSICIST REQUIRED ASAP

Here in picture there is a view of what my book says about the isobaric process is this correct or there is some flaws In it if it is correct then explain this how this is correct especially check the squared portion of article ​

A EXPERIENCED PHYSICIST REQUIRED ASAP Here in picture there is a view of what my book says about the isobaric process is this correct or there is some flaws In class=
Q&A Education