Cryogenics necessary to use a silicon diode for accuracy. Cryogenics In physics, cryogenics is the production and behaviour of materials at very low temperatures. A person who studies elements that have been subjected to extremely cold temperatures is called a "cryogenicist". It is not well-defined at what point on the temperature scale refrigeration ends and cryogenics begins, but scientists assume a gas to be cryogenic if it can be liquefied at or below . The U.S. National Institute of Standards and Technology has chosen to consider the field of cryogenics as that involving temperatures below . This is a logical dividing
English prefix "com-" (with its allomorphs "co-", "col-", "con-", and "cor-"). English prefix English prefixes are affixes (i.e., bound morphemes that provide lexical meaning) that are added before either simple roots or complex "bases" (or "operands") consisting of (a) a root and other affixes, (b) multiple roots, or (c) multiple roots and other affixes. Examples of these follow: English words may consist of multiple prefixes: "anti-pseudo-classicism" (containing both an "anti-" prefix and a "pseudo-" prefix). In English, all prefixes are derivational. This contrasts with English suffixes, which may be either derivational or inflectional. As is often the case with derivational morphology, many