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.
voe. 1  first-person singular present subjunctive of. 2  third-person singular present subjunctive of.
volatile organic compound (VOC). 1.Any hydrocarbon (except ethane and methane) with a vapor pressure equal to or greater than 0.1 millimeters of mercury (mmHg).efinitions (2). 1.Any hydrocarbon (except ethane and methane) with a vapor pressure equal to or greater than 0.1 millimeters of mercury (mmHg).