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how do you blow smoke out of your mouth

When a bunch of these droplets cluster together, they form clouds.

Then as you slowly open your mouth, a puff of “cloud smoke” billows out.
We usually imagine this process happening in the sky. But with a few tricks, you can replicate cloud formation in your mouth, no cold room needed.

Then you hold your lips shut with your hands while trying to blow out to create pressure inside your mouth. This heats up the air even more, because as the pressure increases, so too does the temperature. And warmer air will hold more moisture — or water vapor — than cold air.
Here’s how you do it:
When you open your mouth and let the air out, the pressure and temperature of the air inside your mouth, plummets. As the humid air from your mouth cools down, it loses its ability to hold onto the water vapor, which condenses into tiny water droplets, just like a cloud.
The resulting puff of smoke is what YouTuber Physics Girl has named the “Maculus Ridiculous” — because it makes you look ridiculous — cloud.
First, you need to click your tongue to the roof of your mouth while it’s closed but full of air for 30 seconds. This creates tiny droplets of water in your mouth that, when they evaporate, create warm and humid air.

The smoke is created because of the change in pressure between the inside and outside of your mouth. The tongue clicking and breath holding heat and pressurize the air and water mixture in your mouth.

This really works.

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Then, the clouds should have formed. If you open your mouth and blow out, they should appear.
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To make the cloud, you click your tongue repeatedly on the top of your mouth, making sure your mouth is closed and full of air. Then after 30 seconds, hold your mouth closed and blow out to pressurise it.
The clicking creates little water droplets, which makes them more able to evaporate. Then pressurising the mouth helps them to evaporate even more, because the pressure pushes the temperature up.
A simple, odd process allows anyone to create a tiny cloud in their own mouth.

When blowing out, the temperature drops. Since the outside air is colder, the droplets cool and turn to water — becoming a cloud.

A simple, odd process allows anyone to create a tiny cloud in their own mouth.