What do you think about this /sci/. I'm telling my friend

I think your friend is right. Air pushes you hard but not quite THAT hard I think.

>>7694517
Although what do you mean OP? If you create a big enough vacuum above you then you'll get sucked upward...

>>7694455
Well, if you assume the pressure below acts on an area of 0.1m2, you face a force of about ~100,000N, where gravity only provides ~1,000N for a 100kg person. By removing the air above, you'll experience a net force upwards.

As removing the air above someone is a rather strange scenario, I'm not quite sure if it really could get you to space, but it certainly would lift someone.

According to my terrible calculations, a 100 kg man would be accelerated at atmospheric pressure to 0,05 m2 of surface area at a force of 5000 newtons something like 5-10 g and pass out while being accelerated to terminal velocity. Someone should check my calculations...

>>7694518
Sucked by what? Lol

>>7694563
you're mom lmao

>>7694569
Blowjob jokes aside. A vacuum doesn't suck.

atmospheric pressure is something like 14 psi, force applied will be proportional to the surface area perpendicular to the direction of motion, so if you are laying down, about 10 ft^2 (http://www.medicinenet.com/script/main/art.asp?articlekey=39851). That's 140 lb of force, not enough to lift a 190 lb man.

File: 10336642_582694861831515_4138308903863951268_n.jpg (98KB, 960x826px) Image search: [Google]

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>>7694455

you did it anon
you discovered the secrets of the universe and interplanetary space travel.
pat yourself on the back

>>7694654
-Please use metric units.
-It's "lying down"
-How did you calculate that amount of force?

1 atmosphere = 1 kg/cm2

Surface area of average man 200 cm2 / 2 (pushing on underside)
https://en.wikipedia.org/wiki/Body_surface_area

100 kg force is enough to lift a man. A fatter man will have more surface area so it will be enough to lift him too.

>>7694455
Can you imagine a giant vaccum to suck you up?

If so, you should also believe obsence of air above you will suck you up too. Because what really "sucks" you is the difference in pressure, and by completely eliminating air there's maximal difference possible.

Thus it will suck you harder orat least as hard as the most powerful human vacuum ever created. (Or designed.)

>>7696139
fuck typos

*absence
*or at

>>7694692
>If A Book Store Never Runs Out Of A Certain Book, Dose That Mean Nobody Reads It, Or Everybody Reads It

Truly Jaden is the most pre-eminent philosopher of our age.

>>7696139
>Can you imagine a giant vaccum to suck you up?
No. I can imagine air pushing me up.

>>7694654
Wait, 10 square feet, or 120 * 12 square inches? Then that's 1440lbs of force, if I understand correctly.

>>7696408
Shit, I dumbed before I finished, it's even more than that. It's 1440 square inches time 14, so 20160lbs.

That seems crazy. But then again air pressure vs vacuum forces people through holes like play dough so I can kinda believe it.

>>7694583
Stop arguing stupid semantics. We all know that. It's a way of describing what's happening.

>>7696849
Nah, you don't all know that.

So, what's the consensus? Who is right?

File: crab-sucked-into-mm-pipe-ft-underwater-23448.gif (2MB, 250x244px) Image search: [Google]

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>>7694455
Pic related OP, show this to your friend.

>>7694455
You're MORE right than he is, but you're still not 100% right. Atmospheric pressure at sea level is enough to lift a human being, but you wouldn't be sucked all the way "into space." Eventually you'd reach an altitude where atmospheric pressure isn't high enough to lift you any higher.
>Human body weighs ~750 N
>Cross section is... let's say .15 m^2
>Pressure required to lift is thus 5 kPa
So you'd only get sucked up to about 20,000 meters altitude, not space.

>>7694583
>Hurr, suction doesn't exist
Fuck off.

>>7697611
They're correct, it doesn't.

>Source
Professional house cleaner for a number of years. Naturally this affords me an authoritative position on the physics of pressure gradients in gases, as well as AC motors.

>>7697602
>Eventually you'd reach an altitude where atmospheric pressure isn't high enough to lift you any higher.
At which point you should have reached delta v.

>>7697622
Not really. The faster you go, the less effective pressure there is to propel you. There's a reason why precharged airguns top out at around mach 1 - that's the fastest speed air can expand at.