A balloon inflated with helium is able to float toward the ceiling because
A. the balloon and the gas it contains weigh less than the air displaced by the balloon.
B. the density of the gas inside the balloon is greater than the density of the atmosphere.
C. the pressure of the gas inside the balloon is greater than the atmospheric pressure.
D. the pressure of the gas inside the balloon is less than the atmospheric pressure.
E. the weight of the balloon is greater than the weight of the air displaced by the balloon.
Answer: A
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