A $0\mathrm{.}1$ m radius piston cylinder is filled with $0\mathrm{.}25$ kg of pure helium. It starts at $50\backslash$deg C and at a height of $0\mathrm{.}8$ m$.$ If it is subjected to isobaric heating, how much heat is required to move the piston up by $0\mathrm{.}2$ m$.$ Answer: $104\mathrm{.}9$ kJ