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Photo courtesy A. Loudermilk We ll give you a hint: It s not 867-5309. That s Jenny s number, not Avogadro s. You re also not going to find these digits scrawled in marker on the wall of the public bathroom. You will, however, discover it within the pages of a standard chemistry textbook: It s 6.0221415 × 10 23. Written out, that s 602,214,150,000,000,000,000,000 [source: Fox]. Short on time? Just call it a mole. Just like a dozen is 12 things, a mole is simply Avogadro s number of things. In chemistry, those things are atoms or molecules. In theory, you could have a mole of baseballs or anything else, but given that a mole of baseballs would cover the Earth to a height of several hundred miles, you d be hard-pressed to find good practical use for a mole of anything bigger than a molecule [source: Hill and Kolb]. So if the mole is only used for chemistry, how did Amedeo Avogadro (full name: Lorenzo Romano Amedeo Carlo Avogadro) and chemistry cross paths?

Robert millikanMeisa salaitaMole dayChemical evolutionராபர்ட் மில்லிகன்மச்சம் நாள்இரசாயன பரிணாமம்