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.
Types of Medical Gas. 1  Oxygen: Oxygen is used when patients require supplemental oxygenation due to hypoxemia and hypoxia (insufficient oxygen in the blood). This system consists of a large storage system of liquid oxygen, which is then evaporated into a concentrated oxygen supply.