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
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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