| Conceptual Reference Database for Building Envelope Research |
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| Essay:Water presents in vapor, liquid and solid states"There are five states of matter that are commonly recognized in the universe, solid, liquid, gas, plasma and Bose Einstein Condensate. (http://www.msnucleus.org/membership/html/k-6/wc/atmosphere/2/wcat2_3a.html).About 70 percent of the Earth's surface is water-covered. But water also exists in the air as water vapor and in the ground as soil moisture and in aquifers. US uses about 400 billion gallons per day. The total water supply of the world is 326 million cubic miles (http://ga.water.usgs.gov/edu/earthhowmuch.html) Water exists in three states- solid, liquid, and gaseous. "Water at normal Earth temperatures, is a liquid. When the temperature rises water evaporates into water vapor. Water vapor is part of our atmosphere. As water cools, water becomes a liquid again. If the water vapor freezes, it becomes solid in the form of snow or ice. Water does not have to go from a solid, liquid to a gas. Water can vaporize directly from a solid and a gas can turn into a solid without going through the liquid phase. This is given the term sublimation."
Other links Water Structure and Behavior http://www.lsbu.ac.uk/water/
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