2006-09-02 09:25:08 · 15 answers · asked by Andy S 6 in Science & Mathematics ➔ Other - Science
To let air in, so the coffee/drink can run out. It's the same concept as punching two holes into a can of.....say, sweetened condensed milk to get it out. Anytime you used a 'church key' type can opener to punch a hole in a can, you had to punch two holes - one to let the liquid out, and one to let the air in. If there aren't two holes the liquid runs out much, much slower.
2006-09-02 09:28:19 · answer #1 · answered by They call me ... Trixie. 7 · 2⤊ 0⤋
That is to let air into the cup. If the hole wasn't there the coffee wouldn't flow nice. It wold come out in spurts and spats and make a real mess. Cover it up and see for yourself.
2006-09-02 16:30:44 · answer #2 · answered by N3WJL 5 · 0⤊ 0⤋
It's on all coffee lids. It allows air to get into the cup when you drink to replace the liquid, so you don't create a vacuum.
2006-09-02 16:27:52 · answer #3 · answered by Moonshade 2 · 3⤊ 0⤋
For the flow of air so the liquid can move easily and not make sounds or have to be sucked out.
2006-09-02 16:28:13 · answer #4 · answered by Esoteric 4 · 0⤊ 0⤋
so when you drink the liqid is leaving the cup and there needs to be a way for the air to get in and replace it and the hole lets the air in
2006-09-02 16:31:00 · answer #5 · answered by x1yofuzzy1x 4 · 0⤊ 0⤋
To equalize the air pressure in the drinking vessel.
2006-09-02 16:32:48 · answer #6 · answered by Anonymous · 0⤊ 0⤋
So the stream (heat) can esacpe. If there was no hole the pressure would build up and the top might come off.
2006-09-02 16:32:47 · answer #7 · answered by L'teefaw 3 · 0⤊ 0⤋
It is to relieve the the pressure caused by the hot liquid in the cup.
2006-09-02 20:15:26 · answer #8 · answered by Scott S 4 · 0⤊ 0⤋
to let the air out so bubbles dont come out of the drinking part.
(acoid the suction a water bottle has)
2006-09-02 16:26:47 · answer #9 · answered by kermit 6 · 0⤊ 0⤋
To let the coffee ( or mocha or whatever) cool down at a regular pace. : )
2006-09-02 16:27:55 · answer #10 · answered by sister 2 7 2 · 0⤊ 0⤋