A) High temperature
B) Superconductor
C) Production of fuels
D) Low temperature
Correct Answer: D
Solution :
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 -\[150{{\,}^{o}}C\] \[(123K;\,-238{{\,}^{o}}F)\].
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