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bubble point

British  

noun

  1. chem the temperature at which bubbles just start to appear in a heated liquid mixture

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Those who fret about a bubble point out that housing prices did not even hiccup during last year's recession, suggesting that they exist in their own inflated orbit.

From Time Magazine Archive