2007-11-12 05:05:35 · 14 answers · asked by dontharshmymel 1 in Science & Mathematics ➔ Weather
It is the moisture in your breath condensing in the cold air.
2007-11-12 05:09:13 · answer #1 · answered by ellusionary 5 · 1⤊ 2⤋
Not just when you walk outside and not just on a cold day. Moisture is emitted everytime we breathe out. The air in our bodies (our lungs and breathing apparatus) is always moist.
It's just that in cold environments, the moisture is not quickly absorbed by the surrounding air and appears as vapor.
2007-11-12 13:16:27 · answer #2 · answered by Anonymous · 0⤊ 1⤋
Water vapor is emitted from your mouth with every exhale you make no matter what the weather. You only see it when the temperature is cold because the vapor partially condenses as it exits the warm environment of your body and hits the cold.
2007-11-12 13:10:50 · answer #3 · answered by lunatic 7 · 3⤊ 1⤋
There is a thing with air called a dew point which depends on the temperature, pressure, and the moisture content. It is the point where the water in the air condenses. When you breathe out on a cold day the moisture in your breath condenses in the air causing the vapor.
2007-11-12 13:11:37 · answer #4 · answered by Anonymous · 1⤊ 1⤋
The warm humid air released from your lungs cools quickly as it leaves your body, this lowers the dew pioint, and as such releases the water vapor that was in your breath as minute water droplets that you see as the "vapor".
2007-11-12 13:14:06 · answer #5 · answered by Pennsy Cowboy 1 · 0⤊ 0⤋
Vapor emits from your mouth when you walk outside (or anywhere else) on a warm day, you just see it, or rather the condensation of it, on a cold day because the dew point is lower than the temp of your 'vapor'.
2007-11-12 13:09:36 · answer #6 · answered by credo quia est absurdum 7 · 0⤊ 3⤋
The air outside is cold ... much colder than your breath. When we breathe out, we breathe out moisture along with the air we are breathing out. When the cold air hits that 'warm air' the moisture in that warm air starts to freeze ... so that 'vapor' you see is like 'ice crystals' forming ... until the air you've breathed out 'equalizes' its temperature with the outside air temperature, when it 'disappears' as it spreads out ...
2007-11-12 13:10:37 · answer #7 · answered by Kris L 7 · 1⤊ 2⤋
In order to work properly, your lungs have to be moist. When you exhale, the warm moist air from inside the lungs is released into the air, where it condenses. This is the same principle as the formation of clouds where warm, moist air meets cooler, dryer air.
2007-11-12 13:11:09 · answer #8 · answered by triviatm 6 · 1⤊ 2⤋
It's humid, your breath is warm, the air is cold. This creates the so-called "vapor".
2007-11-12 13:08:35 · answer #9 · answered by Michele N 2 · 0⤊ 2⤋
the heat from your breath meeting the cold outside . That's the simple explanation but someone clever will give you the correct answer
2007-11-12 13:09:50 · answer #10 · answered by ? 5 · 1⤊ 3⤋