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Related Experiment Video

Updated: Jul 2, 2026

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
09:50

Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures

Published on: June 28, 2017

Fiberglas insert to liquid helium Dewar.

S Y Shen1, W P Halperin, J B Ketterson

  • 1Department of Physics and Astronomy, Northwestern University, Evanston, IL 60201, USA.

The Review of Scientific Instruments
|April 1, 1978
PubMed
Summary

A simple Fiberglas insert significantly reduces liquid helium evaporation in metal Dewars. This modification minimizes helium usage for experiments needing less than the full low-temperature volume.

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Area of Science:

  • Cryogenics
  • Materials Science

Background:

  • Conventional metal Dewars are used for low-temperature experiments.
  • Liquid helium evaporation is a significant operational cost and limitation.

Purpose of the Study:

  • To design a cost-effective modification for conventional metal Dewars.
  • To reduce liquid helium evaporation rates.

Main Methods:

  • A simple Fiberglas insert was designed.
  • The insert was integrated into the liquid helium space of a metal Dewar.

Main Results:

  • A considerable reduction in liquid helium evaporation rate was achieved.
  • The modification effectively minimizes helium usage for experiments with lower volume requirements.

Conclusions:

  • The Fiberglas insert is a practical and effective solution for reducing liquid helium consumption.
  • This design offers a method to optimize cryogen usage in low-temperature research.

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Last Updated: Jul 2, 2026

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