Why is it visible when we exhale in cold weather?

 Why is our breath visible in cold weather?

 

Breathing is an important function of most organisms: from fish, to worms to us, inhaling oxygen and exhaling Carbon dioxide and other harmful substances has been important for the function of every organism, since the heart can't function without oxygen. Sometimes, exhaling is visible. It might have happened to you or you might have seen someone else do it, but how does it happen?

When breath becomes fog

So, why does that happen? Well, it is quite simple and it is as well similar to the formation of other natural phenomena. So, basically, 

What happens is that when you exhalez the moist air in your mouth cools of and turns to gas, which laters becomes tiny water droplets; just like fog!

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