The word 'cryogenics' means generation of extremely cold temperatures. In technical terms it is the branch of refrigeration that deals with temperatures below 123 K or -150 degree C. The subject focuses on various methods of generating and sustaining low temperatures, their usage in gas liquefaction and storage, vacuum science and technology, superconductivity, low temperature material science, space simulation chambers, low temperature measurement techniques, etc. More can be learnt about cryogenics by visiting

1) http://eng.fsu.edu/cryolab

2) http://nptel.iitm.ac.in/courses/112101004/

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