Well, I think it is an adiabatic process. Hence the internal energy will be:
E(int)= -W
but I don't know how to calculate this work here. The equation of Work is W= integral(pdV), right? But p changes?
Homework Statement
A balloon containing 2.00 x10^3 m3 of helium gas at 1.00 atm and a temperature of 15.0°C rises rapidly from ground level to an altitude at which the atmospheric pressure is only 0.900 atm. Assume the helium behaves like an ideal gas and the balloon's ascent is too rapid to...