Question: what is the relationship between pressure and volume of a gas in a reversible adiabatic process?
Answer: Ans: In an Adiabatic process heat neither enters nor leaves the system i.e. q = 0 From 1st law of thermodynamics at constant pressure, q = \Delta E + P\Delta V \therefore 0 = \Delta E + P\Delta V or \Delta E = -P\Delta V .... (1) for an infinitesimal small change in a reversible process we can write, dE = -PdV ....