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Two Hydrogen atoms covalently bonded to one Oxygen atom. One of the more common compounds on the surface of the earth.

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Why does ice form on bridges even if the temperature is above freezing?

As most people should know the evaporation of water requires energy and this lowers the temperature. The lowest temperature a wet object can reach is what is called the "wet-bulb temperature." … In order for said wet object to get close to the wet-bulb temperature, some convection needs to occur in order to take that evaporated water away (i.e. wind). …
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