Na vodní hladinu dopadne kapka oleje o hmotnosti 0,08 mg, olej se rozteče a vytvoří tenkou homogenní vrstvu ve tvaru kruhu o ploše 200 cm2,. Předpokládejte, Že tloušt'ka vrstrvy je stejná jako průrněr molekuly. Vypočtěte z těchto údajů průměr molekuly oleje, Jestli Že jeho hustota je 9,2.102 kg .m-3
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