Why we can see our breath in the cold or why does something like smoke (fog) come out of the mouth during winter? Everyone must have experienced this phenomenon in cold weather, but do you know about the science behind it that why it happens? So the answer is when you throw your breath out, the fog or smoke you actually see is Water.
Everyone must be aware that we take oxygen from the air and when we exhale, carbon dioxide (CO2) comes out through the nose. But the truth is that not only does CO2 released, but water comes out as well, and at this current moment, it's still being released but we can't see it. And if you do the same thing with your mouth, that means you breathe out through your mouth, CO2 and water will still be there, but in the form of moisture, in invisible form. Now the fact is that the water in our breath that appears like a small, misty cloud while exhaling, needs a warm temperature to remain invisible.
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The human body contains almost 70% of water, the air in our lungs is almost completely saturated with water vapor and has the same temperature as our body. As your body is warm inside, that water remains in the form of water vapor (water in gas form) in the lungs. In winter, the temperature inside the body remains warm as usual, but the temperature outside in cold weather reaches around 7 or 8 degrees. So as you exhale through your mouth in the morning, the water comes out from your body in the form of water vapor and as soon as it comes in contact with the cold air outside, it does not remain hot, it becomes cold, and thus its energy decreases, so rather than moving freely in vapor form, it starts to turn into liquid form as the cold air causes the warm moisture in our breath to condense into tiny droplets of water.
As a result, these water vapors begin to appear in front of us, they often appear in a certain form, a form that we can see as a small cloud of winter fog, and this scientific process is called condensation. But when the outside temperature remains high i.e. in the summer season, the water vapor remains invisible.
So due to the huge difference between the internal body temperature and the cold environmental temperature outside, this phenomenon can come into view. In simple words, the sudden change of hot water into cold water causes it to change from an invisible to a visible state, and during summer both the internal body temperature and the outside environmental temperature remain warm, so we cannot experience this phenomenon.
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