Question

explain the liquification of helium by kapitza method

Answer 1

In the Kapitza helium liquefier at the Mond laboratory, Cambridge, helium is first led through a reducing valve and then through charcoal immersed in liquid air to remove impurities. It then passes through a bath of liquid hydrogen.

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Answer 2

In the kapitza helium liquefier at the mond laboratory, Cambridge, helium is first led through a reducing value and then through charcoal immersed in liquid air to remove impurities. It then passes through a bath of liquid hydrogen.

Explanation:

• kapitza's method consists of precooling compressed helium gas at some 30 atmospheres pressure by the use of liquid air boiling under reduced at about 65K.
• The gas than passes through interchange and expands to 1 atmosphere at the throttle valve. The vapour of the gas then escapes out of the liquefier through the outer tube of the interchanger.
• To create the liquid and superfluid state, you cool down helium gas to a few degrees above absolute zero.