ok, the weight of the air in the atmosphere above ur head is quite great, why doesn't ur head get crushed? well, i somehow understand the physics concept, but i just can't explain it.T^T
help me please
thanks!
2007-03-15 12:49:12 · 7 answers · asked by Ganbatteru 3 in Science & Mathematics ➔ Physics
Because the pressure above your head is the same as anywhere else around and inside your head. Therefore the net force on a point of your head is practically null (because the pressures inside and outside balance out).
2007-03-15 13:06:39 · answer #1 · answered by physicist 4 · 0⤊ 0⤋
Air basically has NO weight...unlike water which is 8 lbs per gallon. If you think about it, when you go underwater the 8lbs in the water are stacking up heavier and heavier the deeper you go due to the fact of the denseness of the water. Air has almost no weight its around the barometric pressure of 29.92, and at 68 degrees F it weighs about .075 lbs feet^3 (cubed). The higher altitude and/or colder it is, the less air weighs. Due to the fact of density change. Think of it this way, the closer to the surface you are the denser the air...In water, the closer to the sea floor, the denser water is.
2007-03-15 20:05:28 · answer #2 · answered by Screaminfiero 3 · 0⤊ 0⤋
Because the structures your head is made of are able to easily withstand standard air pressure. Bone, cartilage, and flesh is quite strong.
In addition, the spaces in your body are also at atmospheric pressure, so you don't have any imbalance of pressures for your body to deal with.
When you dive in a pool and you begin to feel pressure on your ears, that is the water pressure pushing against the air pockets in your head. If you 'valsalva' and equalize your ears, you are increasing the pressure in your head to match the pressure of the water.
2007-03-15 19:56:29 · answer #3 · answered by dukedingo 2 · 0⤊ 0⤋
As much air is inside pushing out as outside pushing in. If you hold your breath, plug your nose and dive to the bottom of a pool, you feel the pressure, especially on your ears. If you use SCUBA, the air pressure inside you is the same as the air pressure + water pressure outside.
BTW, the toughest part of developing SCUBA was designing a safe, reliable pressure regulator. Think what would happen if it WASN'T equal inside the mouthpiece and in the water...
2007-03-15 22:10:22 · answer #4 · answered by Anonymous · 0⤊ 0⤋
The whole of the body is at the same atmospheric pressure.
...No pressure difference to cause crushing.
2007-03-15 19:55:20 · answer #5 · answered by Norrie 7 · 0⤊ 0⤋
what pressure? i can't feel it. Atmosphere pressure is urban legend. :D
2007-03-15 20:02:20 · answer #6 · answered by ? 6 · 0⤊ 0⤋
i have no clue
2007-03-15 19:57:01 · answer #7 · answered by Zac L 1 · 0⤊ 0⤋