little bursts?
Uneven flow can happen when air cannot enter the cup smoothly as liquid leaves. A vent can help reduce this effect, although the drinking opening, cup shape, and lid design also play a role.
A Tiny Detail With a Practical Purpose
The next time you buy a takeaway coffee, take a closer look at the little hole in the lid. On many designs, it’s a simple vent that helps air move as you sip, making the flow of your drink more consistent.
It’s not a complicated invention, and
