When a piece of iron or other substance is magnetized, the molecules yank one way. When the substance is demagnetized the molecules jerk helter-skelter. The magnetic yanking causes molecular friction and produces an appreciable amount of heat which Professor Wrilliam F. Giauque, University of California chemist, used last week to reach the lowest degree of cold yet attained by man.
The temperature which Professor Giauque was trying for was Absolute Zero or 459.4° below zero Fahrenheit. Investigators had almost reached that point before by compressing helium gas and drawing off the heat...
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