A balloon is filled with helium gas. When each of the following changes are made at consta...

A balloon is filled with helium gas. When each of the following changes are made at constant temperature, which of these diagrams (A, B, or C) shows the final volume of the balloon?

a. The balloon floats to a higher altitude where the outside pressure is lower.

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b. The balloon is taken inside the house, but the atmospheric pressure remains the same.

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c. The balloon is put in a hyperbaric chamber in which the pressure is increased.