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25. Large helium-filled balloons are used to lift scientific
equipment to high altitudes. (a) What is the pressure
inside such a balloon if it starts out at sea level with a
temperature of 10.0°C and rises to an altitude where its
volume is twenty times the original volume and its
temperature is – 50.0°C? (b) What is the gauge
pressure? (Assume atmospheric pressure is constant.)

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