A clown at the circus blows up a balloon with helium. This balloon will not float to the ceiling unless
A. the pressure of the helium inside the balloon is less than the atmospheric pressure.
B. the balloon and the helium it contains weigh less than the air displaced by the balloon.
C. the pressure of the helium inside the balloon is greater than the atmospheric pressure.
D. the weight of the balloon is less than the weight of the air displaced by the balloon.
Answer: B
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