Studies of the vastness of the universe and the invisible smallness of the atom are remote from the things of everyday life. Scientists also go far from familiar things in the study of low temperatures. Hydrogen liquefies at 252.7° below zero Centigrade and helium liquefies at 268.9°. Compared to such temperatures, the inside of an ice-cream freezer is a seething furnace. The utmost cold, absolute zero (zero on the Kelvin scale), comes out at 273.13° on the arbitrary Centigrade scale (zero for the freezing point of water, 100 for the boiling point)....
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