Question
It seems that dew does not form on the grass in my yard in the early morning until the Sun comes up and strikes the grass. Is this an accurate observation, and why does it happen?
Answer
The dew is on the grass before the Sun hits it; the Sun actually evaporates the collected dew. Dew forms when the air becomes saturated and the moisture needs another place to go. This happens when the temperature drops, which occurs once the Sun goes down. Go out for a walk before the Sun comes up, and you’ll more than likely come back with wet feet.
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