For a molecule of air to escape, its velocity must exceed the escape velocity from earth at that height - almost as if each were a sub-microscopic "space-craft".
At an altitude of say 200 km there is virtually no air and the air density is only about 2.9 x 10-10 kg/m3.
What little air there is at a temperature of about 930K and each molecule has an average velocity of about 1040 m/s.
Now at that altitude of 200 km the escape velocity is about 11,000 m/s.
If you go up to 400 km, where the ISS orbits, that air density is only about 1.75 x 10-10 kg/m3, the average velocity of about 1244 m/s.
And even up that high, the escape velocity is still about 10,852 m/s.
So only a small fraction of the few molecules up that high are travelling fast enough to escape the gravity of the earth.
So your molecules just before your space have to travel so fast to break into space?
This stuff is so sickening it's not even funny...well, it is sort of funny but it's more sickening how people actually fall for this clear and utter nonsense.
Yes, just as spacecraft do, but instead of ridiculing how about giving some logical rebuttal - I guess that you can't, so all you can do is to resort to ridicule.
A logical rebuttal is in the so called spacecraft itself but people will refuse to see it.
The so called spacecraft is apparently pressurised to 14.7 pounds per square inch.
That pressurisation is supposedly happening inside a skin that is so flimsy that it can be holed with little effort.
And yet that pressure is apparently pushing the walls of the so called spaceship out against a resistance of.....?......of?......NOTHING as far as you people are concerned, in your space.
I know I know. "but, but scepti, it's only 14.7 pounds per square inch, it's nothing, look at us living under it with no issue."
This is where I cringe. This is where I absolutely fail to grasp how supposed intelligent people can just reel off this stuff until I realise that, to actually tell the truth would be to actually tell the truth and kill it all off in one fell swoop.
"But scepti you've seen scuba tanks and big pressure tanks, they don't explode or rupture."
The arguments are many and desperate.
The only way I can explain something to people about the power of denpressure is to rob Peter to pay Paul kind of thing.
It's so easy to do and so easy to see why this supposed free space nonsense is what it is (fiction).
Grab a bottle. A small glass bottle will do. Something that will not buckle.
Now just using your own mouth, evacuate some air from that bottle.
Do you understand what you did to enable your lips/tongue to now be jammed into that bottle top?
Do you understand what you did for this to happen?
Here's what people think.
They think you sucked air from the bottle and the air left in is pulling your tongue into the bottle.
This is absolutely not what happens but is easy to see why people think it.
People like Rab will understand that a pressure differential has been created and your mouth has actually pushed away the air by crushing it back into your mouth to allow the evacuation of some of the air from the bottle.
Seems weird, right?
But that's what happens.
So what about the reaction?
The reaction is you've now created a bigger pressure in your mouth by allowing that evacuated pressure to naturally EXPAND out of that bottle.
But you also notice how hard it is to evacuate air from a glass bottle, right?
Now this is just one simple little attempt at allowing evacuation or one small suck as some people would think. I'm serious when I say this. People need to learn what this evacuation of atmosphere is and they will definitely understand denpressure, or at least the crux of the simplicity of it against the nonsense of a so called vacuum or near vacuum like we are all told.
So now you feel your tongue being supposedly sucked into the bottle neck but understand now that suck does not exist. It's a pressure squeeze of atmosphere you compressed pushing back against the lower pressure you created which cannot readily resist with the same force like it did before you put your mouth on it and allowed some out.
Can anyone see what I'm saying?
People will certainly jump in and shout " we know how a bottle with air works scepti." The thing is, most actually don't. They think they do and that's why people fall flat when they are told about evacuation chambers and why they do not do what people think and also why so called space cannot work with a globe and why so called spaceships cannot exist in a so called near vacuum of random flying particles in a nothingness.
Come on people put some effort in and try and understand this. Not you Rab. I'm doing this through your post. People would best serve themselves by thinking for themselves and stop looking at the nonsense spewed out by mainstream.