Trending. 1  Apple is about to dramatically change the way you use an iPhone The trusty home button is going away. 2  Apple to FCC: Protect net neutrality and donât allow online fast lanes Itâs the companyâs first comments in the 2017 debate.
COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
Quick Answer. The most common formula for elemental oxygen is O2. This molecule is the major naturally existing form of elemental oxygen and is also called dioxygen, diatomic oxygen, oxygen gas and molecular oxygen. The other natural form of elemental oxygen is O3, an unstable molecule known as ozone. Continue Reading.