The organic carbon compounds (Organic Carbon) is the main component, and have a vapour pressure greater than 0.1.Millimeter of mercury at temperatures 20° c, and pressure of 760 mmHg.
Organic compounds containing carbon (Organic Carbon) is a major component. And a vapor pressure of more than 0.1 mmHg at a temperature of 20 degrees Celsius and a pressure of 760 mm Hg.