Ncert Exercises & Solutions

Q. 23 A hot air balloon is a sphere of radius 8 m. The air inside is at a temperature of 60°C. How large a mass can the balloon lift when the outside temperature is 20°C? Assume air is an ideal gas, R=8.314 J mol $e^{- 1} K^{- 1},$ 1 atm = 1.013 $\times 10^{5}$ Pa, the membrane tension is 5 $N m^{- 1}$ .