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 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 English prefixes can only be added to bases of