Often before sunrise on a clear,calm,cold morning,ice (frost)can be seen on the tops of parked cars,even when the air temperature is above freezing.This condition happens because the tops of the cars are cooling by

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Ice (frost) can form on the tops of parked cars even when the air temperature is above freezing because of radiation cooling. As heat radiates from the car's surface to the colder atmosphere, the surface temperature drops below the dew point, causing water vapor in the air to condense and freeze onto the surface. This process is known as radiative cooling.

Often Before Sunrise on a Clear,calm,cold Morning,ice (Frost)can Be Seen