Private Pilot Private Practice Exam

Question: 1 / 605

Frost forms under which conditions?

The temperature is above the dewpoint

The temperature of the collecting surface is at or below the dewpoint and below freezing

Frost forms when the temperature of the collecting surface is at or below the dewpoint and below freezing. This occurs because, as air cools, its capacity to hold moisture decreases. When the temperature of surfaces, such as the ground, leaves, or aircraft wings, drops to or below the dewpoint, water vapor in the air can condense and freeze upon contact with these colder surfaces. The presence of freezing temperatures ensures that this condensation turns directly into frost rather than forming dew.

In this scenario, the air can indeed be saturated (at 100% humidity), but without the additional condition of the surface being at or below the dewpoint and below freezing, frost will not form. Therefore, the specified conditions are critical for frost formation, making this the correct choice.

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The temperature of the air is below freezing

The humidity is at 100%

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