. . "In physics, cryogenics is the study of the production and behaviour of materials at very low temperatures.It is not well-defined at what point on the temperature scale refrigeration ends and cryogenics begins, but scientists assume it starts at or below \u2212150 \u00B0C (123 K; \u2212238 \u00B0F). The National Institute of Standards and Technology has chosen to consider the field of cryogenics as that involving temperatures below \u2212180 \u00B0C or \u2212292.00 \u00B0F or 93.15 K."@en .