References and simple equations
PV = nRT where P is pressure (in atm), V is volume (in liters), n is number of moles and T is temperature (in K); R is a constant and is equal to 0.08206 L atm/moleK.
Molecular Shape including thickness(radius) of membrane curvature is v/al where v=volume,a=area per headgroup, and l=thickness of the hydrocarbon monolayer
Guerra, D. Membrane Biochemistry notes