7.13 Measurement of Specific Heat at Low Temperatures

A cryostat for experiment at low temperature is shown in Fig. 7.20. It consists of a Dewar's flask containing liquid nitrogen. Inside this flask, there is another Dewar's flask containing liquid helium. A metal ring with taper end is sealed to the inner flask. This is connected to a metal cap through rubber gaskets. Experimental equipments are placed inside a thin-walled metal tube of Monel or super nickel hung from the metal cap by a fibre. Since helium can diffuse through pyrex glass, provision is made to pump out the gas from the double-walled region of the inner flask.


Cryostat for experiment at low temperature


Fig. 7.20 Cryostat ...

Get Heat and Thermodynamics now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.