Does tap water really go stale or is that all in your head? (From 2015)
sleep with a cool, fresh glass of tap water by your bed and wake up to it tasting decidedly...off. Ever so slightly more dirt-like, I’d say. Musty, heavy, or oily, others have said. The taste difference is subtle and hard to describe, in a way that leads people who haven’t noticed to“I know exactly what you’re talking about,” says Susan Richardson, a chemist at the University of South Carolina.
Nobody has published a study on why water goes stale overnight, as far as we know. But Richardson and her colleagues did put their scientific minds together to come up with some answers—at least, some very probable answers. I also called up a water sommelier, Martin Riese, because that’s a job that apparently exists in LA.The biggest factor, says Richardson, is likely a simple, indirect one: temperature. “Like warm beer versus cold beer,” she says.
As water rises to room temperature, its aroma and bouquet, so to speak, really open up. “When you chill something extremely,” says Riese, “your taste palate’s completely gone.” We often use “taste” colloquially to mean “smell,” and smell is a function of molecules tickling cells in our noses. The warmer the drink, the faster the molecules are bouncing around, and the stronger the aroma. Riese always tastes his premium waters—such as Danish spring water—at room temperature.
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