Which of the following is used as a refrigerant?
(A) Nitrogen
(B) Sulphur
(C) Water vapour
(D) Carbon dioxide
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Answer:
Option (C) Water vapour.
Explanation:
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Explanation:
NITROGEN is used as a refrigerant. Nitrogen is a liquid at temperatures below 196.5 C and is used as a refrigerant for such things as preservation of blood and cooling of large computer systems, as well as some industrial uses. Being a liquid, it is more convenient to use for low temperature cooling than dry ice. Liquid nitrogen is also used in oil wells to build up pressure in order to force crude oil upward.
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