Hacker News·5 min read·medium
The most official water costs $120k a gallon
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✦AI Summary
This article explains why high-precision scientific measurements require specific isotopic compositions of water, which can cost up to $120,000 per gallon. It details how variations in hydrogen and oxygen isotopes affect the physical properties of water.
We all learned in science class that water freezes at 0 °C or 32 °F at atmospheric pressure. But what water, exactly? Even after you distill out all the dissolved salts and minerals to get pure H 2 O, not all H 2 O is created equal – and for the most precise temperature measurements, the differences really matter.
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