Liquid nitrogen can be used as a cryogenic substance to obtain lowtemperatures. Under atmospheric pressure, liquid nitrogen boils at 77 K, allowing low temperatures to be reached. However, if thenitrogen is placed in a sealed, insulated container connected to avacuum pump, even lower temperatures can be reached. Why? If thevacuum pump has sufficient capacity and is left on for an extendedperiod of time, the liquid nitrogen starts to freeze. Explain.
Liquid nitrogen can be used as a cryogenic substance to obtain lowtemperatures. Under atmospheric pressure, liquid nitrogen boils at 77 K, allowing low temperatures to be reached. However, if thenitrogen is placed in a sealed, insulated container connected to avacuum pump, even lower temperatures can be reached. Why? If thevacuum pump has sufficient capacity and is left on for an extendedperiod of time, the liquid nitrogen starts to freeze. Explain.
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter9: Liquids And Solids
Section: Chapter Questions
Problem 117AE
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Liquid nitrogen can be used as a cryogenic substance to obtain low
temperatures. Under atmospheric pressure, liquid nitrogen boils at 77 K, allowing low temperatures to be reached. However, if the
nitrogen is placed in a sealed, insulated container connected to a
vacuum pump, even lower temperatures can be reached. Why? If the
vacuum pump has sufficient capacity and is left on for an extended
period of time, the liquid nitrogen starts to freeze. Explain.
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