SAT, 30.10.2021 23:10 P4thing

a helium balloon is filled on the ground where the atmospheric pressure is 768 torr. the volume of the balloon is 8.00 m3. when the balloon reaches an altitude of 4200 m, its volume is found to be 16.8 m3. assuming that the temperature remains constant, what is the air pressure at 4200 m in torr?

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