Minimally invasive arthroscopic procedure to remove articular cartilage in the knee. Articular cartilage is a firm rubbery tissue that covers the ends of bones. It provides a smooth gliding surface for joints and acts as a cushion between bones. Cartilage can break down due to overuse or injury.
While normal atmosphere contains between 20.8 and 21 percent oxygen, OSHA defines as oxygen deficient any atmosphere that contains less than 19.5 percent oxygen, and as oxygen enriched, any atmosphere that contains more than 22 percent.
Definition. noun. (chemistry) A colorless, tasteless, oderless, gaseous element that abounds in the atmosphere. Supplement. In chemistry, oxygen is an element with an atomic weight of 15.96. It is capable of combining with all elements, with the exception of fluorine, to form oxides, bases, oxyacid anhydrides, etc.At room temperature, oxygen is only moderately active with most substances.upplement. In chemistry, oxygen is an element with an atomic weight of 15.96. It is capable of combining with all elements, with the exception of fluorine, to form oxides, bases, oxyacid anhydrides, etc.