A large balloon of volume 1500 m3 is filled with helium gas at a pressure of 120 kPa and temperature of 27 oC. The balloon is released and it rises. At a certain height, the temperature of helium in the balloon decreases to 13°C, but the volume of the balloon remains constant. (a) What is the pressure of helium in the balloon? [ans: 103 kPa] (b) What is the change in the internal energy of the helium gas in the balloon?

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