Why is it that when you blow with your mouth in an 'o' shape, it's cool air, but if you blow with your mouth is a wider shape (like people sometimes do when they clean their glasses) it's warm air?
2006-08-23 07:55:17 · 25 answers · asked by mzdarkstar 2 in Health ➔ Other - Health
i often used to wonder about this myself...isnt that weird?
What i've concluded is the following:
When you blow out in the form of a little 'o' you generally want to cool something, like a hot cup of tea. The air you take in at that particular time is air taken in by the mouth, and then exhaled by the mouth, in a very short space of time, like 'quick in and quick out'. In this way you are circulating air, pretty much in the way that a fan works in a car.
When you want hot air you part your lips wider to access warmer air which is inside your throat (having just come from the lungs quite naturally). The act of parting the lips is to allow the warm air to come out in a burst (in the act of letting out warm air (have you ever seen people when they're cold, letting out warm air onto their hands in a natural sort of way).
Most people dont think about this in the way that you have (by way of your question) or I have, having had this question myself, but if you really think about it, you *can* blow out warm air even if your mouth is 'o' shaped. its just a more natural thing to circulate cold air in an 'o' shape because of the act of a quick intake and immediate release, and warm air with parted lips to gain better access to the throat. Hope this sheds light...take care o_O
2006-08-23 08:24:03 · answer #1 · answered by Wisdom 4 · 0⤊ 0⤋
Because the smaller the opening of the mouth the faster the air moves. The faster the air moves the greater the cooling effect. As you blow with your mouth in an O shape the air moves rapidly over your soft moist lips causing evaporation and cooling. If you breath gently through a more widely open mouth the cooling effect is not noticeable and you feel the warmth of your breath.
2006-08-23 08:11:29 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I do believe within moderation outgoing air is warm O shape or compressed. But when O shape the air cools almost immediately causing condensation so droplets of moisture vapourise and being denser prevent the air from the mouth exiting rapidly, thus more time to cool..a theory, howqever it could be that the property of the exhaled o breath is just a larger quantity at once so more is noticeable & cooler.
2006-08-23 08:03:18 · answer #3 · answered by nan 2 · 0⤊ 0⤋
When you blow with closed lips, an O shape, it is air from your mouth coming out. When you blow with your mouth open, it is a deeper blow, and the air is coming form your lungs. Try both and see. If you make an O shape and try to breath from your lungs, it will be warmer and steam up glass.
2006-08-23 08:02:57 · answer #4 · answered by sassy_91 4 · 0⤊ 0⤋
Usually the air you blow out into the 'o' shape is air that you pull into your mouth and blew out immediately.. The hot air that you blow comes from the air already in the lungs, inhaled air. Wait .. No, I just tried it and thats not the case either.
Weird, I dont know.
2006-08-23 08:01:52 · answer #5 · answered by ironica7 4 · 1⤊ 0⤋
this is because when ur mouth is in an o shape it is blowing air thats present but if its wider then ur blowing the air that was inside of u
2006-08-23 07:58:12 · answer #6 · answered by elle 2 · 1⤊ 0⤋
not sure...maybe because when you blow with the o shape the hole is much smaller and so the air comes out quicker. Or because it comes out in a thinner stream it cools much quicker. When it comes out in a bigger cloud maybe only the outer particles cool and so the middle ones still feel warm
2006-08-23 07:57:26 · answer #7 · answered by Showaddywaddy 5 · 1⤊ 0⤋
When you blow air at a higher velocity it pulls more room air along with it (entrained air) which brings the overall temperature down (room air cooler than the air in your lungs). Low velocity air flow is all about your internal body temperature.
2006-08-23 08:06:10 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Ever heard of the wind chill factor?
Fast moving air gains a colder edge to it than slow moving air.
Air pushed out through an 'o' shape is pushed out through a smaller space so its under higher pressure meaning it moves faster.
2006-08-23 08:02:12 · answer #9 · answered by ty_rosewood 5 · 2⤊ 0⤋
The air comes from a different place in your body when you do both these things..
2006-08-23 07:57:42 · answer #10 · answered by confused 6 · 0⤊ 0⤋