MSGID: 1:317/3 6295063c   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    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.   
      
      
    Ice Crystal Formation on Frozen Soap Bubble   
      
      May 30, 2022   
      
      
       PatriciaR_IMG_0475a dusted cr 40 percent (003)   
      
      Photographer: Patricia Rasmussen   
      
      Summary Authors:  Patricia Rasmussen;  Jim Foster   
      
      There are several things of interest visible in this image of a frozen   
       soap bubble, which is approximately 1 in (2.5 cm) in diameter. The   
      soap bubble film is a sandwich made up of two soap layers with a water   
      layer in between. Colors near the central portion of the bubble are   
      likely due to diffraction processes -- light is interacting with the   
      thin soap film.  Light waves are diffracted or scattered by the   
      varying thickness of the film in such a way that the waves interfere   
      with each other, creating regions of enhanced  color (constructive   
      interference).   
      
       Frost crystals form in the water layer part of the bubble film; the   
      bubble itself is a hollow sphere. When photographing the crystals, the   
      depth of field is very shallow. So, the photographer chooses the place   
      where crystal growth is most active and the crystal pattern most   
      beautiful. Thus, the focus is either on the front or back wall of the   
      bubble. In this case, the back wall is prominent, while the growing   
      crystals on the front wall give a cloudy/hazy illusion to the image.   
      Note that as the bubble ages, the film becomes thinner, and the color   
      fades just before the bubble pops.   
      
      This photo was taken from my unheated garage on February 24, 2022. The   
      bubble is blown using a straw onto a base of snow, artificially   
      backlit, with some purple-tinted cracked ice for interest. "Bubblers"   
      say this is a highly addictive photographic subject because of the   
      seemingly infinite variables that cause the coloration and crystal   
      growth. It is!  Click here to see a video of the crystals forming   
      between the inner and outer surfaces of the bubble. Notice in this   
      video that initially the crystals are rapidly swirling around the   
      bubble, likely from my breath as I blow through the straw.   
      
      Photo details: Canon 90D camera; F11; 1/250; 100 mm focal length; ISO   
      800. Post processing was general—levels, contrast, and a small crop.   
        * Eagle River, Wisconsin Coordinates: 45.9172, -89.2443   
      
   Related EPODs   
      
       Ice Crystal Formation on Frozen Soap Bubble  2022 Ice Out Dates   
      for Sebago Lake, Maine  Melting Frost on a Windshield  Palmer   
      Archipelago, Antarctica Reflection  Hoarfrost Crystals in Maine   
       Roof Top Icing   
       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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