Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the
Question 1 Report
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the
Answer Details
Water in an open container boils when the vapor pressure of the water equals the atmospheric pressure. At higher altitudes, the atmospheric pressure is lower than at sea-level because the column of air above is shorter. As a result, water boils at a lower temperature at higher altitudes because the lower pressure means that water molecules need less thermal energy to break the intermolecular bonds and evaporate into the air. Therefore, the correct option is that at the top of a mountain, the pressure is lower than that at sea-level, leading to a lower boiling point of water.
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