Each molecule of water is made up of two hydrogen atoms bonded to one oxygen atom. In 1766, during an acid metal reaction, Henry Cavendish first formally recognized hydrogen. In 1781 he also found that hydrogen produces water when burned.
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U.S. EPA Definition of VOC (Volatile Organic Compounds) : The U.S. Environmental Protection Agency (U.S. EPA) defines and uses the term Volatile Organic Compounds (VOC). The term VOC is defined in the Federal Register. The original definition of VOC made reference to the vapor pressure of the. compounds (greater than 0.1 millimeter of mercury) as a determinant of volatility. However, the current definition relies solely.