DEW POINT--

Defined, dew point is:  The temperature to which a given parcel of humid air must be cooled, at constant barometric pressure, for water vapor to condense into water.

That condensed water is called dew as in the above photo.

When the temperature cools to the dew point, as defined above, water vapor also usually turns into fog.

Pilots need to have a very clear comprehension of that fact.

Poets sometimes refer to it as involving locomotion on little cat's feet.

These days I like to think in the latter terms.
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The above photo was taken during yesterday's foggy morning while hiking the trail below my dam using Canon's 100 mm f/2.8 macro lens on a Canon Rebel XTi digital single lens reflex camera.  I didn't want to get my new Rebel T3i wet while frolicking in the weeds. < Smile >