The world's most precise water costs $120,000 a gallon

Vienna Standard Mean Ocean Water — Senior Airman Zachary Foster / U.S. Air Force / Public domain (Wikimedia Commons)

A 5-milliliter ampoule of the world's most precise water sells for $159 — about $120,000 a gallon, Signore Galilei writes. It is Vienna Standard Mean Ocean Water (VSMOW), and labs buy it because water's freezing point varies based on its elemental isotopes. — Read the rest

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