the thermodynamics of a hot liquid in a bottle

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I use hot water to mix up my protein shakes (for reasons). I’ve gotten good at putting the powder in, and the lid on, and then shaking lightly before releasing the built up pressure. After this, I screw the lid back down and can shake the shit out of the beverage with no worries of pressure buildup.

I find this confusing because the beverage is maybe a couple degrees cooler than when I first put the powder in so shouldn’t it build up pressure just as quickly as it did at first?

Thank you for listening to my crazy ramblings 😅

In: Chemistry

6 Answers

Anonymous 0 Comments

At some point the script flips, and instead of building pressure from evaporation you’ll actually start to draw a slight vacuum as the warm gas continues to cool and tries to contract.

Shaking the liquid briefly breaks it up into a bunch of droplets with large surface area so the cooling can be quite rapid.

Also I have reported you to the FBI for making hot water protein shakes. Surely this is illegal somewhere somehow.

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