Cryogenics scale, both of which measure from absolute zero, rather than more usual scales such as Celsius or Fahrenheit, with their zeroes at arbitrary temperatures. The word "cryogenics" stems from Greek "κρύο (cryo)" – "cold" + "γονική (genic)" – "having to do with production". Cryogenic fluids with their boiling point in Kelvin Liquefied gases, such as liquid nitrogen and liquid helium, are used in many cryogenic applications. Liquid nitrogen is the most commonly used element in cryogenics and is legally purchasable around the world. Liquid helium is also commonly used and allows for the lowest attainable temperatures to be reached. These
English words first attested in Chaucer English words first attested in Chaucer English words first attested in Chaucer, or special manuscript words of Chaucer, are a set of about two thousand English words that Geoffrey Chaucer is credited as being the first use found today in existing manuscripts. This does not necessarily mean that he was the person to introduce these words into English, but that the earliest extant uses of these words are found in Chaucerian manuscripts. Many of the words were already in everyday speech in 14th-century England (especially London). The claim is that these words are found for the first time in written