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>When dew forms on clear nights, it will heavily wet lawns but will
>hardly ever leave visible moisture on concrete walkways or asphalt
>roads. There are many factors that regulate condensation:
>temperature, available condensation nucleii, curvature, hydrophilic
>surfaces, etc. - but I am having difficulty identifying the primary
>one in this case. Any ideas out there?
The primary mechanism is radiation exchange with 2 pi steradians of a
3 kelvin blackbody plus high resistance thermal conduction pathways
to the ground and the (still) air.
John Mallinckrodt mailto:email@example.com