When the dew point is determined with respect to a flat surface of ice, it is called the ice point.

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Quizplus · Accepted Answer

When the dew point is determined with respect to a flat surface of ice, it is called the frost point, not the ice point. The dew point refers to the temperature at which air becomes saturated with moisture when cooling, leading to dew formation on surfaces. The frost point specifically refers to the temperature at which moisture in the air will freeze upon surfaces, forming frost, when the reference surface is ice.

When the Dew Point Is Determined with Respect to a Flat