By free expansion, I am referring to gas kept in a piston-cylinder arrangement freely allowed to expand against vacuum.
It is clear to me that free expansion is an irreversible process because if it were not then it could get compressed as well at equilibrium, but we know it doesn't as it would be violating the 2nd law of thermodynamics.
I know that all the parameters work 'W', Change in Internal Energy '∆U', and Heat transfer '∆Q' would all be zero in the case of an ideal gas.
But, what I couldn't understand is the difference between isothermal free expansion and adiabatic free expansion?
Also, I want to ask if Joule expansion is the same thing?
P.S. I have asked a different question related to it here Free Expansion - Ideal Gas vs Real Gas