That small extra hole on a disposable coffee cup lid is not decoration or about aroma. It works with the sip spout to keep your drink flowing smoothly. When you sip, liquid leaves the cup, and that opening alone would create a slight vacuum, causing glugs and sudden splashes.The vent hole lets air slip in as coffee flows out, keeping pressure balanced for an even sip. It also gives steam from hot drinks a safe escape so pressure does not build and push scalding liquid through the spout at once. Covering the vent makes the flow stutter, a simple way to feel how essential that tiny opening really is.
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