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This video lecture includes discussion of the physical properties of gases and demonstrates how air is liquefied. Liquefied gases are a key resource for survival with an amazing range of applications and there are now few industries which are not in some way dependent on this major raw material. Life-saving operations in hospitals, the purification of polluted rivers and lakes, and superconductivity are but a few fields which require liquefied gas supplies. The lecture includes a demonstration of superconductivity with the effect of flux pinning. The lecture is 59 minutes in length.
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