I’ve always wondered since I was a kid why it does this.
[This image is representative of what I’m talking about](https://i.pinimg.com/474x/66/68/d6/6668d6e7d6cc10177eb2196c84a822d6–sweet-tea-making-memories.jpg)
In: Chemistry
Others have mentioned the milk’s thickness, but that’s only part of the equation. Milk has proteins in it. Those proteins are like really long, really sticky chains. The ends of the chains are really good at grabbing onto each other like Velcro, because they’re meant to hold things (like cells) together. This means that when you blow bubbles into the milk, those proteins at the surface will try to hold onto each other, and as the air pushes upwards they will stretch out or flex instead of simply breaking. When the air reaches the surface, it has a thin membrane of fluid and proteins holding onto each other. This forms a bubble.
This is also why pee can be foamy. Excess foam is an indicator that your kidneys may be filtering out lots of proteins. Maybe because you simply have a high protein diet and your body doesn’t need all of the proteins it has, or maybe you have some sort of kidney issue.
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