It’s a small detail that’s easy to overlook, but it illustrates how even the simplest everyday objects can be designed to solve practical problems.
The Main Purpose of the Tiny Hole
The small opening on many takeaway coffee lids is commonly called a vent hole. Its main job is to help balance the air pressure inside the cup as you drink.
When you sip coffee through the larger drinking opening, liquid leaves the cup. Air needs to enter to replace the space occupied by that liquid. Without enough airflow, the
