Cryogenics 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 line, since the normal boiling points of the
Prefix forms may or may not qualify for inclusion in such a list. This list takes the broad view that "acro-" and "auto-" count as English derivational prefixes because they function the same way that prefixes such as "over-" and "self-" do. As for numeral prefixes, only the most common members of that class are included here. There is a large separate table covering them all at Numeral prefix > Table of number prefixes in English. The choice between hyphenation or solid styling for prefixes in English is covered at Hyphen > Prefixes and suffixes. The most commonly used prefix in