Cryogenic engineering

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Cryogenic engineering is a sub stream of

. Generally, temperatures below cold come under the purview of cryogenic engineering. Cryogenics may be considered as the recent advancement in the field of refrigeration. Though there is no fixed demarcation as to where refrigeration ends and cryogenics begins even then for general reference temperature below –150c(120k) are considered as cryogenic temperature. The four gases which mainly contribute for cryogenic application and research are (O2-B.P.90K), (N2-B.P.77K), (Helium-B.P.4.2k) & (H2-B.P.20K). The word "cryogenic" is derived from Greek κρύο (cryo) – "cold" + γονική (genic) – "having to do with production".