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Related to Avogadro's law: Avogadro's constant
Avogadro's law[¦a·və¦gäd·drōz ‚lȯ]
The law which states that under the same conditions of pressure and temperature, equal volumes of all gases contain equal numbers of molecules; for example, 359 cubic feet at 32°F and 1 atmosphere for a perfect gas. Also known as Avogadro's hypothesis.