The small hole on a coffee lid acts as an essential air vent that balances pressure inside the cup.
As you sip, air enters through the vent to replace liquid, preventing uneven spurts and ensuring a smooth flow.
Although the opening improves airflow, it does not make the cup spillproof or serve primarily as a steam valve.
This tiny design detail demonstrates how simple, functional features make everyday drinking experiences much more comfortable and enjoyable.
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