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      Question

      Which of the following best explains why cooking takes

      longer at high altitudes?
      A Atmospheric pressure is lower, so water boils at a lower temperature Correct Answer Incorrect Answer
      B Air is colder, so stoves heat water more slowly Correct Answer Incorrect Answer
      C Air contains less oxygen, so burners produce less heat Correct Answer Incorrect Answer
      D Humidity is higher, so heat transfer is reduced Correct Answer Incorrect Answer

      Solution

      At higher altitudes, atmospheric pressure is lower than at sea level. The boiling point of water depends on external pressure: when pressure decreases, water molecules need less energy to escape into the vapor phase, so water boils at a temperature below 100∘ C. 

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