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ARC-Challenge / MCAS_2004_9_21-v1 / A party shop delivers helium-filled balloons to homes and businesses. The owners…

Problem

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question

A party shop delivers helium-filled balloons to homes and businesses. The owners realize from experience that on hot summer days they should inflate the balloons only three-quarters full. On cold winter days they can fully inflate the balloons. Which of the following is the best hypothesis to explain this observation?

choices

  • The helium gas is more active in the winter season.
  • Air outside the balloons leaks into the balloons.
  • As the temperature increases, the helium in the balloons expands.
  • Outdoor air pressure in the summer is less than indoor air pressure.

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Source and history

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