Comments by "Yazzam X" (@yazzamx6380) on "National Geographic"
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@aliali-xx9ru - What you (and all other flat Earth believers) fail to understand is that a vacuum, from our point of view, is an absence of air!
Most people know our atmosphere gets thinner with altitude, i.e. there's less air as we climb. I'm sure you know that too, hence I'm sure you are also aware of the difficulty in breathing for mountain climbers or anyone at high altitudes.
But lets go even higher...
At 10 miles up, there is 10 TIMES less air compared to sea level. That's a low vacuum, where your saliva will boil at that altitude, and at 12 miles up your blood will start to boil!
You can easily recreate those same conditions with any vacuum chamber!
At 20 miles up, there is 100 times less air compared to sea level, that's a medium vacuum.
At 30 miles up, there is 1000 times less air, that's also a medium vacuum.
At 50 miles up, there is a 1,000,000 times less air, that's a high vacuum.
Low Earth orbit is an ultra high vacuum and so on.
Therefore there isn't a sharp line where we suddenly go from our pressurized atmosphere to the vacuum of space, instead it is a gradual process, where with increasing altitude there's decreasing air, resulting in gradually increasing vacuum conditions as I've shown above (normal pressure -> low vacuum -> medium vacuum -> high vacuum -> ultra high vacuum and so on).
The decreasing air pressure and hence the increasing vacuum conditions with altitude has been directly measured by instruments on balloons and on aircraft sent up to high altitudes, hence up to altitudes of whatever flat Earth theorists are willing to accept.
So given the explanation of how we encounter increasing vacuum conditions with altitude as there's less and less air, you should now understand how we go from the pressure of our atmosphere here on the surface of the Earth to the vacuum of space without a barrier in between.
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