Questionsà van der Waals gas and equation of state
-What are the main differences between the ideal and real gas models?
-What kind of interaction is between the molecules of a real gas?
-How the short-range and long-range interaction is accounted for, in the van der Waals equation of state?
-What are the physical meaning of the “a” and “b” parameters in the van der Waals equation of state?
-How do the van der Waals isotherms look like over and below tc?
-How we define the critical points for the van der Waals gas?
-Which are the unphysical regions on the van der Waals isotherms?
-How do we replace the unphysical parts of the van der Waals isotherms?
-Why the gas doesn’t always turn into liquid if ml<mg?
-What is the condition that for ml<mg a liquid droplet of radius R will increase it’s diameter?
-Can you explain why in the presence of impurities the nucleation of liquid droplets for ml <mg is easier (the gas turns into liquid more easier)?
Class problem:
- Calculate the “a” parameter in the van der Waals equation of state, with the parameters K and σ in  the Lenard-Jones potential.