A weather balloon has a volume 12 m3 at sea level where the, Ask an Expert

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A weather balloon has a volume 1.2 m^3 at sea level where the pressure is 101 kPa and the temperature is 20 C. When the balloon rises to an altitude of 11 km, the pressure is down to 50.5 kPa and the temperature is about -55 C. What is the volume of the balloon then?

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