How often have you wondered about the hidden complexities of what happens when a pot of water comes to a boil? Here's the answer.
Kenji is the former culinary director for Serious Eats and a current culinary consultant for the site. He is also a New York Times food columnist and the author of The Food Lab: Better Home Cooking Through Science.
In Bogotá, for example, which is a good 8,000 feet above sea level, water that appears to me to be around 165°F is in reality a good 14 or 15 degrees cooler. In fact, go up high enough, and it becomes nearly impossible to poach eggs—the water comes to a full boil long before appropriate poaching temperatures can be reached).This altitude effect can wreak all sorts of havoc on recipes. Beans don't cook right. Pasta never softens. Stews take longer to braise.
On a much grander scale, entire galaxies were formed when matter started to collect in gravity wells formed initially by tiny nucleation sites in the early universe. This baffles scientists . But that's neither here nor there "Microwaves take advantage of this fact by shooting waves that cause water molecules to rapidly flip back and forth."
As soon as some turbulence is introduced—a little wobble from the turntable, for example—bubbles burst forth, sending hot water all over the inside of your microwave. This doesn't happen on the stovetop, since heating from the bottom of the pot creates lots of convection currents . Pop the lid on, however, and you cut the amount of evaporation that takes place. Less evaporation means higher max temperature. In my quick test at home, putting on the lid increased temperatures in the pot by almost 25 degrees!
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