What does cryogenics mean?
Cryogenics is the branch of physics and engineering that deals with producing and studying extremely low temperatures — generally those below about −150 °C, where ordinary gases like oxygen and nitrogen become liquids or solids and materials behave in striking new ways. At such cold conditions, some substances become superconductors, conducting electricity with no resistance, while helium can flow as an almost frictionless superfluid. These phenomena make cryogenics essential to modern technology: magnetic resonance imaging (MRI) scanners, particle accelerators, and quantum computers all depend on cryogenic cooling, often using liquid helium. The word derives from the Greek roots 'kryos' (icy cold) and 'genes' (producing), so it literally means 'the production of icy cold'. Grammatically, cryogenics ends in -s but behaves as a singular subject, taking the verb 'is' rather than 'are'. Though sometimes confused with cryonics — the speculative freezing of human bodies — cryogenics itself is a rigorous, well-established scientific discipline with wide industrial application.
nounThe branch of physics and engineering concerned with the production and behaviour of materials at very low temperatures, typically below about −150 °C (−238 °F).
- The branch of physics and engineering dealing with the production and effects of very low temperatures (below roughly −150 °C).
"Advances in cryogenics have made it possible to store biological samples for decades without degradation."
"The MRI machine relies on cryogenics to keep its superconducting magnets cooled with liquid helium."
"She joined the national laboratory's cryogenics division to research superfluid behavior near absolute zero."
Cryogenics is a plurale tantum by form only: it always takes singular agreement and has no distinct plural. To refer to individual instances, use phrases such as 'cryogenic processes' or 'low-temperature systems'.
"Cryogenics is central to the design of modern superconducting magnets."
The coldest place in the universe isn't deep space — it's a cryogenics lab on Earth, where temperatures dip billions of times colder than the vacuum of space.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does cryogenics come from?
Cryogenics comes from the Greek 'kryos', meaning icy cold or frost, combined with 'genes', meaning born or produced, giving the literal sense 'producing cold'. The related adjective 'cryogenic' and the noun 'cryogen' (a refrigerant such as liquid nitrogen) share this root, as do modern terms like 'cryostat' and 'cryotherapy'. The word emerged in the late nineteenth century alongside the pioneering low-temperature experiments of scientists such as James Dewar and Heike Kamerlingh Onnes, who first liquefied hydrogen and helium respectively.
Related word forms
How cryogenics is actually used
A formal, technical term used chiefly in scientific and engineering contexts; it functions grammatically as a plural-form noun but takes singular agreement ('cryogenics is'). It should not be confused with the popular but unproven practice of cryonics.
Easily confused with cryogenics
Cryonics is the speculative practice of freezing human bodies after death in hopes of future revival, whereas cryogenics is the established scientific study of very low temperatures.