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Related Experiment Videos

Liquid nitrogen: how to make it last

J R Walsh1

  • 1Newcrest Mining Group, Ora Banda, WA.

The Medical Journal of Australia
|December 4, 1995
PubMed
Summary
This summary is machine-generated.

Glass vacuum flasks offer superior insulation compared to stainless steel. A glass-lined flask kept liquid nitrogen significantly colder than a steel-lined one over eight hours.

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Area of Science:

  • Thermodynamics
  • Materials Science

Background:

  • Vacuum flasks are essential for maintaining thermal insulation.
  • Different envelope materials may impact heat transfer rates.

Purpose of the Study:

  • To compare heat flow into vacuum flasks with glass versus stainless steel envelopes.
  • To determine the insulating efficiency of different vacuum flask materials.

Main Methods:

  • A prospective, non-randomized comparison was conducted with two vacuum flasks.
  • The primary outcome measure was the change in liquid nitrogen content over time.

Main Results:

  • The stainless steel flask lost approximately 800 g of liquid nitrogen within eight hours.
  • The glass-lined flask lost only about 100 g of liquid nitrogen in the same period.

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  • The heat leakage rate for the stainless steel flask was approximately eight times higher than the glass flask.

    • Conclusions:

    • Glass-lined vacuum flasks provide superior thermal insulation compared to stainless steel flasks.
    • Glass vacuum flasks are more effective for preserving cold temperatures, such as for liquid nitrogen.
    • The findings suggest glass vacuum flasks are also better for keeping hot beverages warm.