at what temperature does your breath become visable like a fog....???

Answer 1

When your breath becomes visible what you're seeing is the water vapour in your breath forming into tiny droplets of water. This happens because air can only contain so much water vapour and when the limit is reached (called saturation vapour point and the same as relative humidity of 100%) the excess vapour forms water droplets.

The warmer air is the more water vapour it can contain before reaching SVP.

So, the colder the air is and the more water vapour it already contains the greater the chance that you'll see your breath. But it also depends on the temperature of your breath (hotter when breathing slower), the volume of air that you exhale, the water content in the exhaled air and how quickly the exhaled air is disipated by the wind.

You've probably noticed that there's more chance of seeing your breath on a still day when the 'fog' just hangs in the air - that's because the water vapour you breath out isn't being dispersed. You may also have noticed that there's more chance of seeing your breath when the air is already very damp and particularly if you're drinking a hot drink outside.

Given the right combination of conditions you could see your breath in temperatures as high as 36 Celsius but it's very unlikely and it would only just be visible.

In short, the colder, damper and stiller the air and the warmer and more moist your breath the greater the chance of seeing your breath.

Answer 2

The guy that talked about the "dew point" has half of it right. Let's say that the dew point will be 65 degrees F. So if the temperature is higher than 65 F, it has to drop to 65 F before dew will start to gather on the grass or any surface for that matter. The amount of humidity can make the dew point higher than the hottest part of the day. But in order for your breath to become visible, your breath must be at least 20 degrees F warmer than the outside temperature. The higher the percentage of humidity, the more "fog" you'll see.

Answer 3

There is no one answer to this question. It depends not only on the temperature of the air but also its humidity, and also what the temperature and humidity of your breath is. When you see your breath it is because something called a "mixing cloud" is formed, where two non-saturated parcels of air mix to form one that is saturated. It is definitely not at the dewpoint of the outside air--since if the air would be at that temperature it would already be foggy. For more information see http://www.hko.gov.hk/education/edu06nature/ele_mixing_e.htm

Answer 4

The temperature will fluctuate and can be as high as 47-48 degrees. It's the temp that oxygen will form react with the humidity. It's call the dew point. You will hear your local news weatherman speak of it often.

Answer 5

I think it is more the difference in temperature...the fog look appears when your body temperature is warmer than the temperature outside. This link of a previously asked question may help you.
http://au.answers.yahoo.com/question/index?qid=20070111231556AAs7Muj

Answer 6

A good question for a Minnesotan. I've noticed my breath getting steamy in 40-something degree weather (Fahrenheit).

Answer 7

I'm pretty sure it's somewhere around 40 degrees. That is if you breathe hot air.

Answer 8

air temp must be colder, in the 40-30 range or below

Answer 9

ive always thought not of the outter temp but of the temp difference.,if there is a great temp diff(dont exactly know how much) then that will happen..

Answer 10

like about 39F or 10C