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In this video:

The “fog” you may sometimes experience on your glasses or goggles occurs when atmospheric humidity near the lens condenses; this happens due to a relatively significant discrepancy between the temperature of the lens and the surrounding air. As the surface attempts to reach an equilibrium between the two temperatures, heat energy is given up; and, as the energy within the gaseous water molecules decreases, they form into tiny water droplets on your lens, otherwise known as “fog.”

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Sources:

https://en.wikipedia.org/wiki/Anti-fog
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http://www.leisurepro.com/blog/scuba-...
https://en.wikipedia.org/wiki/Hydrophile
http://www.google.ch/patents/US4189364
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https://en.wikipedia.org/wiki/Surfactant
http://www.weetect.com/anti-fog-solut...
https://en.wikipedia.org/wiki/Condens...
https://en.wikipedia.org/wiki/Dew_point
http://physics.about.com/od/physicsex...
https://en.wikipedia.org/wiki/Surface...