I hear about the vacuum of space quite often but have never actually seen any documentation of just how much vacuum it would pull. I would like it if someone could answer my question of how much of a vacuum it really is.
I have always taken it to mean, The vacume of space is any location that can hold mass but currently does not. As apposed to Nothing, which can never hold anything because it does not exist.
I thought it was an attempted to differentiate between Space and Nothing.
But i am a bit of newby on this stuff… soz. Wait for a pro to turn up.
Vacuum is not necessarily all that empty
Well of course it isn’t empty - all the gas particles being stretched out etc.
But how close was my explanation Astro or was i talking out my hat again ?
I mean in space like the moon, or in orbit around the earth. I know about objects and how they occupy space but I mean as in strapping yourself to a giant missle and launching yourself toward the sky ( I have been wanting to say something like that for a long time. Why would anyone wanna fly, expecally when feul is expencive and if you run out,your %$#@ed )
Rebel, vacuum isn’t a “thing” it’s absence of something like dark is an absence of light. Your vacuum cleaner doesn’t suck dirt any more than a flashlight sucks up dark. It uses a fan to evacuate air from a bag so the higher atmosphere pressure pushes air and dirt into it. You can only measure vacuum relative to a pressure so what you’re really measuring is the pressure of your reference. If I have two boxes full of “Absolute space vacuum*” there will be no measurable difference between them. If one box has sea level earth atmosphere I’ll measure a vacuum of 14.7lb per square inch… or a pressure of 14.7psi, it just depends on which side you’re standing on. If you come from a different planet your frame of reference for “normal” pressure may be completely different.
*For the sake of argument one molecule per cubic meter.
so more or less a space craft have to hold an earth atmosphere of about 14.7 psi. I have always wondered that. basically a basketball with say,50psi sent into space , the pressure inside the ball would stay the same and if it could handle en extra 14.7 psi it wouldnt explode>?
Actually, humans can function down to about 5 PSI, though they won’t be running any marathons. The spacesuits used by shuttle crews can be as low as 4.3 PSI, pure oxygen.
The same is true of conventional aircraft. A 747 at 30,000 feet has an internal cabin pressure considerably lower than sea level. If they could somehow keep it at around 14.7 PSI, passengers wouldn’t suffer any of the ear-popping or other effects. This is impractical, though.
That’s right.
Well, strictly speaking, the extra pressure across the skin might cause the ball to expand slightly, causing the pressure to drop slightly. But it should be a small effect. If it were a rigid aluminum can, the pressure would stay exactly the same.
Thats what I wanted to know thank you all
<<<<< PS What does IHMO mean?>>>>>>
In My Humble Opinion it means… oh.
The vacuum of space is the same vacuum anywhere: an Electrolux.