Joey is holding a party balloon filled with helium, and the helium has the same temperature $80$ degrees F and pressure $0\mathrm{.}95$ atm as the air outside $.$ The balloon is approximately spherical with diameter roughly $20$ cm$.$ Throughout the day, the air outside slowly drops to $60$ degrees F but its pressure remains the same, and therefore so does the pressure inside the balloon whose size naturally adjusts so that the pressure inside and outside are very nearly the same. What is the change $($in Joules$)$ in thermal energy of the air in the balloon?