Subj : ES Picture of the Day 02  2022
To   : All
From : Dan Richter
Date : Mon May 02 2022 12:01:18

 EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


 Melting Frost on a Windshield

   May 02, 2022

    Water drops and frost
   Photographer:  Glenn McCreery

   Summary Author:  Glenn McCreery

   The photo above shows  frost that formed on the outside of my car's
   windshield following a very cold night and warming morning air
   temperature. Frost builds on surfaces when its temperature is lower
   than freezing and moisture (humidity) is in the air at or above
    freezing temperature. The vapor  sublimates directly to form the
    solid ice crystals of frost without going through the liquid phase,
   but these crystals do not necessarily have the six-sided symmetry of
   three-dimensional  snow crystals.   Adhesive forces between the
   sublimating ice crystals and microscopic surface irregularities help
   dictate the more irregular two-dimensional frost geometry.
   When the frost crystals melt, the resultant liquid drops tend to form
   shapes that minimize the energy of the drops. The resultant surface
   tension  cohesive forces between water molecules, and adhesive
   forces between water and the surface and ice crystals, pull the drops
   into more  hemispherical shapes. This melting process may be seen on
   the left side of the photograph. Melting first occurred on the left
   side of the windshield because the glass is curved, and the Sun was
   shining from this side. Photo taken on November 21, 2020.

   Photo details: Olympus TG 4, 25mm (35mm equivalent), f/2.8, 1/80 second
   exposure, ISO-100.
     * Idaho Falls, Idaho Coordinates: 43.493, -112.040

Related EPODs

    Melting Frost on a Windshield  Palmer Archipelago, Antarctica
   Reflection  Hoarfrost Crystals in Maine  Roof Top Icing  Ice
   Blade in Bucket  Archive - Heart-Shaped Opening of a Michigan Ice
   Cave
    More...

Cryosphere Links

     *  Guide to Frost
     *  What is the Cryosphere?
     *  Bentley Snow Crystals
     *  Glaciers of the World
     *  Ice, Snow, and Glaciers: The Water Cycle
     *  The National Snow and Ice Data Center Google Earth Images
     *  Snow and Ice Crystals

-
   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

https://epod.usra.edu
 
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