It's happened to all of us at least once. We're heating milk for a sauce, or oatmeal, or any number of things, but there are just a few bubbles around the edge. We turn away for just a minute to do something else, and the next thing we know, there's steamy, sputtering milk cascading over our stove top. What gives?!
Why Milk Boils Over...And How to Stop It!
Here's what's happening in that little pot:
As milk heats, the water in its structure starts evaporating from the surface. This concentrates the remaining fat and proteins into a thicker layer at the top of the pot. This layer eventually becomes so thick that water vapor rising through the milk can't break through very easily and gets trapped.
The layer is so uniform that you can't necessarily see what's boiling up right underneath, except in little bubbles around the edges. You see where this is going?!
Sure enough, enough water vapor eventually collects that it raises the thickened layer above it and breaks violently through. And, voila! The milk boils over!
There are a few ways we can prevent this from happening. One is to be sure to stir the pot of milk every few minutes to break up the top layer, allow the steam to escape, and make sure it's heating evenly. We've also heard that you can leave a long-handled spoon in the pot and the handle will provide a conduit for the steam to escape.
A pot of milk on the stove is also just one of those things that you can't turn your back on. We've definitely learned this lesson the hard way - more than once!
Do you have a horror story of milk boiling over?
Related: Why I Don't Drink Skim Milk
(Image: Flickr member .j.e.n.n.y. licensed under Creative Commons)
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Food Science, Tips & Techniques, Dairy Products, cream, milk, kitchen science, cooking milkRelated Links
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This happened to me literally thirty seconds ago. I was infusing cream with garlic and thyme for a gratin, I turned my back to check something on the computer, and suddenly it was a huge bubbly mess. Glad to know I'm not alone!
view smallkitchcara's profile
Almost always with out fail when I'm making pasta-roni or any of those box side dishes that require milk. Even though its cut with water, almost always boils over.
view jamina1's profile
Never had this problem - I have a UFO-shaped metal thingy and when you put it in the pot with milk, the milk boils like water.
I think this is called pot watcher or milk guard.
view Mel P.'s profile
you can put the pot of milk in a larger pot filled with water and then put the larger pot on fire. The milk boils to glory but never overflows.
view Cactina's profile
i saw a ceramic disk at a kitchen shop advertised as a proof against boil-over. i kinda doubted it. anyone have any experience with it?
view nico_forgot's profile
When I was teaching myself to cook oh so many years ago, the hardest thing to learn was what to turn my back on (i.e. leave it alone so it could do its thing) vs. what to watch like a hawk. Milk is definitely latter. I have finally, after about 30 years of cooking my own meals, figured out how to walk away and let a pork chop or steak properly brown. It's all experience.
Milk starts to really give off the steam when it's about to erupt--you can always just lift it up off the burner at that point.
view Charlotte's profile
@nico_forgot: I take it this is what you're referring to? http://www.manufactum.de/Produkt/189620/752037/Milchwaechter.html or, if your German isn't up to it, try this: http://translate.google.com/translate?u=http%3A%2F%2Fwww.manufactum.de%2FProdukt%2F189620%2F752037%2FMilchwaechter.html&sl=&tl=en
It works, trust me, I've been using it for years!
view ulf_nz's profile