[Rosalind Franklin]

Hi guys!!
I was just wondering if there was any relation between Andrew's isotherm and latent heat. Can we say that the dome in Andrew's isotherm actually represents latent heat?

[mjc123]

By "dome" do you mean the area of the P-V graph that contains the horizontal portions of the isotherms below the critical temperature? Then, no.
The length of the horizontal portion is equal to the change in volume on vaporisation at the saturation vapour pressure. Multiply this by the pressure and you have the expansion work of vaporisation. This is an element of the enthalpy of vaporisation, but not the major one:
ΔH_vap = ΔU_vap + P_sat(T)ΔV_vap(T, P_sat)

[Rosalind Franklin]

Yes I was referring to the area under P-V graph. Thanks a lot!!