the.com/rolling boil

The point water stops negotiating and starts actually boiling, bubbles everywhere, no pausing when stirred.

means A boil so vigorous that the bubbling continues even when you stir the water, as opposed to a gentle simmer that quits the moment you disturb it.

from Straightforward compound English: 'rolling' describing the constant, tumbling motion of the water (the same sense as a 'rolling wave' or 'rolling thunder' — continuous, unbroken action) plus 'boil,' from Old French 'boillir,' tracing back to Latin 'bullire,' to bubble (itself kin to 'bulla,' a bubble or round swelling). The phrase likely sharpened into a precise kitchen and recipe term as cooking instructions needed to distinguish a true, sustained boil from water that merely simmers or shivers at the edges.

temp
212°F at sea level, not higher
the test
bubbles persist even after stirring
why pasta needs it
prevents sticking and uneven cooking
altitude trap
boils cooler up high, still looks rolling
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