Balloon weighing 5 kg has a shell volume of 48.83 cubic meters. The ball rises up from the surface of the Earth. Determine how high it can rise if the atmospheric pressure decreases twice every 5 km. The pressure at the surface of the Earth is 100 kPa, the temperature in the stratosphere at the height of the rise is -60 ° C. The answer is to express in kilometers and round up to integers. The molar mass of air is taken equal to 29 g / mol.

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