- #1

orthovector

- 115

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[tex] Work_{net} = Q_{in} - Q_{out} [/tex]

it's easy to see why 2 adiabatic processes cannot cross on a PV diagram when connected by an isothermal process.

however, why is the 2nd law true without taking a statistical approach?

Why must we have heat flow in order to get work out of an engine?