turns into steam
solidifies into ice pellets
first condenses into liquid form
is just sufficient to cause cooling
has a relative humidity of fifty percent
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Dew points indicate the amount moisture in the air. The higher the dew points, the higher the moisture content of the air at a given temperature. Dew point temperature is defined as the temperature to which the air would have to cool (at constant pressure and constant water vapor content) in order to reach saturation. A state of saturation exists when the air is holding the maximum amount of water vapor possible at the existing temperature and pressure.
When the dew point temperature and air temperature are equal, the air is said to be saturated. Dew point temperature is NEVER GREATER than the air temperature. Therefore, if the air cools, moisture must be removed from the air and this is accomplished through condensation. This process results in the formation of tiny water droplets that can lead to the development of fog, frost, clouds, or even precipitation.

The correct answer is C
Cooling can happen at many temperatures without condensation occurring

"...Dew point temperature is defined as the temperature to which the air would have to cool... in order to reach saturation."
"...this is accomplished through condensation."
The dewpoint is the temperature where condensation begins — i.e. when water vapor first condenses into liquid form → which is option C.

The correct answer is:
C. first condenses into liquid form
Dewpoint is the temperature at which air becomes saturated with moisture, causing water vapor to condense into liquid droplets.

