Explain why, at temperatures below freezing, the saturation vapor pressure over water is greater than the saturation vapor pressure over ice
What will be an ideal response?
ANSWER: An appropriate student answer would be that when both water and ice exist at the same temperature below freezing, the saturation vapor pressure just above the water is greater than the saturation vapor pressure over ice. In other words, at any temperature below freezing, it takes more vapor molecules to saturate air directly above water than it does to saturate air directly above ice. This situation occurs because it is harder for molecules to escape an ice surface than a water surface. Consequently, fewer molecules escape the ice surface at a given temperature, requiring fewer in the vapor phase to maintain equilibrium.
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