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