4C30.80 - Liquid Nitrogen - Making Liquid O2

Pour liquid nitrogen in the small dewar to cool it to the proper temperature.  When the boiling ceases, pour all the liquid nitrogen from the dewar into the copper funnel.  Place the dewar under the point of the copper funnel to collect the liquid oxygen.  You should be able to collect 50 to 100 ml in a 20 minute time frame.
Code Number:
4C30.80
Demo Title:
Liquid Nitrogen - Making Liquid O2
Condition:
Excellent
Principle:
Cryogenics
Area of Study:
Heat & Fluids
Equipment:
Liquid Nitrogen, Copper funnel, Dewars,
Procedure:

Pour liquid nitrogen in the small dewar to cool it to the proper temperature.  When the boiling ceases, pour all the liquid nitrogen from the dewar into the copper funnel.  Place the dewar under the point of the copper funnel to collect the liquid oxygen.  You should be able to collect 50 to 100 ml in a 20 minute time frame.

References:
  • Thomas K. McCarthy, "Two Cryogenic Demonstrations", TPT, Vol. 29, # 9, Dec. 1991, p. 575.


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