Expansion of a gas in vacuum is called free-expansion. Calculate the work done and the change in internal energy when 1 L of ideal gas expands isothermally into vacuum until its total volume is 5 L?
Work done, W = ${ -p }_{ ext }$ (V2-V1)As ${ p }_{ ext }$ =0 , so W = -0(5-1) = 0For isothermal expansion,∆U = 0 as ∆T = 0
