What is normal air pressure in N/cm^2?


by rogerk8
Tags: n or cm2, normal, pressure
rogerk8
rogerk8 is offline
#37
Feb16-14, 06:09 PM
P: 183
The thought is that pressure from the outside of its skin is pressing equally much from the inside of its skin.

And putting one finger of my left hand against one finger of my right hand with increasing force/pressure makes me think that that guys skin is rough.

Don't you think so too?

Best regards, Roger
Vanadium 50
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#38
Feb16-14, 07:04 PM
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I ask again. Why is the skin different from any other part of its body?
rogerk8
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#39
Feb17-14, 07:40 AM
P: 183
I totally get it now.

Consider a lidless and bottomless box of fragile ginger bread (that we say is water resistant). Let's place this fragile frame at a table (1atm) first. Being causious it will stand unharmed.

Now, moving it slowly down into water it will remain unharmed regardless of depth and therefore pressure!

It is not until we move it at a certain speed (especially sideways) according to

[tex]p=1/2\rho v^2[/tex]
that we generate an additional pressure component which will destroy the frame.

In other words, ambient pressure has no effect whatsoever (it just states that there is some fluid available). It's the density of the fluid and speed of the object, in this case, that has effect. More generally, "felt" pressure is indeed differential.

Roger and out
lendav_rott
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#40
Feb17-14, 08:10 AM
P: 221
We're simply used to 1 atm, hence we don't feel it. If you can, go to few hundred meters below the ground level, you'll start to feel something's different :D
russ_watters
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#41
Feb17-14, 10:52 AM
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Quote Quote by lendav_rott View Post
We're simply used to 1 atm, hence we don't feel it. If you can, go to few hundred meters below the ground level, you'll start to feel something's different :D
Not correct. You need to reread the thread.
B737
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#42
Feb17-14, 11:54 AM
P: 1
Hello I'm a pilot
I was discussin with a friend about the center of gravity of an aircraft n we didn't agree
This is my question :
We all know that the center of gravity moves forward and aft the question is
Does the center of gravity moves up and down??
Lookin forward for a reply

Thx


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dauto
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#43
Feb17-14, 03:10 PM
P: 1,271
Quote Quote by B737 View Post
Hello I'm a pilot
I was discussin with a friend about the center of gravity of an aircraft n we didn't agree
This is my question :
We all know that the center of gravity moves forward and aft the question is
Does the center of gravity moves up and down??
Lookin forward for a reply

Thx


Sent from my iPhone using Physics Forums
You should start a new thread and make the question a bit more clear.


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