Absolute Zero
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-264
2025-12-27
539
If a given mass of gas with a volume of 273 c.c. at zero is steadily cooled, its volume will be 263 c.c at - 10°, 253 с.c. at - 20°, and so on. The logical conclusion would be that if the temperature were reduced to - 273° the volume of the gas would be zero. Before reaching that temperature, however, gases change into liquids. The temperature - 273° is called the absolute zero, and temperatures based upon this temperature as 0° are called absolute temperatures and expressed as degrees Kelvin. Thus 20° C. = 293° K. Gases are liquefied by increasing the pressure and reducing the temperature, and by the evaporation of liquid helium under reduced pressure the temperature has been brought as low as - 270°.
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