地球的正中間壓力多大

ttlegyq

什么是重力？就是萬有引力。
# o1 H2 _- e% g那么當你在地心時，你就時個點，沒有質量，那么你對地球沒有引力，那這個時候只有地球內部的引力。
假設地球是個水球，把水球分成360分，那么每一份都有相對180度處有一個相反的一份和他平衡，兩者均向中心點有引力作用，也就作用在你身上。以此類推可以得出有360分引力對你產生壓力。用微積分地球分成N分，然后計算總的引力，就是對你的壓力。好大好大。

開水滋養

內部核心（inner core）壓力在330到360 GPa之間
" V( }5 W) k" K) R/ F參考：David. R. Lide, ed (2006-2007). CRC Handbook of Chemistry and Physics (87th ed.). pp. 14–13.

開水滋養

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Temperature and pressure

The temperature of the inner core can be estimated by considering both the theoretical and the experimentally demonstrated constraints on the melting temperature of impure iron at the pressure which iron is under at the boundary of the inner core (about 330 GPa). These considerations suggest that its temperature is about 5,700 K (5,430 °C; 9,800 °F).[13] The pressure in the Earth's inner core is slightly higher than it is at the boundary between the outer and inner cores: it ranges from about 330 to 360 gigapascals (3,300,000 to 3,600,000 atm).[14] Iron can be solid at such high temperatures only because its melting temperature increases dramatically at pressures of that magnitude (see the Clausius–Clapeyron relation).[15]

so
The inner core of the Earth has temperatures and pressures so great that the metals are squeezed together and are not able to move about like a liquid, but are forced to vibrate in place as a solid. The inner core begins about 4000 miles beneath the crust and is about 800 miles thick. The temperatures may reach 9000 dgrees F. and the pressures are 45,000,000 pounds per square inch. This is 3,000,000 times the air pressure on you at sea level!!!

pacelife

應該可以通過微積分算出來的

狙擊手

ttlegyq 發表于 2013-4-6 18:36
. w( p; u7 g, g8 A  q8 M" ^什么是重力？就是萬有引力。
; o: A; S# u$ \+ x" p那么當你在地心時，你就時個點，沒有質量，那么你對地球沒有引力，那這個時候 ...

謝謝以上各位的指點！
1 {  x: O' R" h2 J3 d8 g  我還是認為，要計算沒有問題，關鍵是如何界定。
* A% Y3 G4 ]5 Z) c     看做是水球沒錯，看做是太空的衛星也沒錯。
         地球也是一大球，也是漂浮在太空的，不妨我們縮小事物來觀察下： 放到太空的水球，中間是什么壓力呢？  
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kwj1983

有點害怕了，都搞上這層面了。