The problem states:
A paper ball is made which has a volume of V=0.1m3 and filled with the hot air of temperature T=340K. Outside temperature is T=290K while the pressure inside the ball and outside the ball is both p=100kPa. What should the mass of paper of the ball be that it would be able to arise in the air?
this question wasn't answered 3 years ago, I don't understand what mass changes here? do we have to calculate Archimede's force?
the molecular mass of the air M=29g/mole