那么当你在地心时，你就时个点，没有质量，那么你对地球没有引力，那这个时候只有地球内部的引力。
假设地球是个水球，把水球分成360分，那么每一份都有相对180度处有一个相反的一份和他平衡，两者均向中心点有引力作用，也就作用在你身上。以此类推可以得出有360分引力对你产生压力。用微积分地球分成N分，然后计算总的引力，就是对你的压力。好大好大。 内部核心（inner core）压力在330到360 GPa之间
参考：David. R. Lide, ed (2006-2007). CRC Handbook of Chemistry and Physics (87th ed.). pp. 14–13. 本帖最后由 开水滋养 于 2013-4-6 18:47 编辑
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). 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). 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).
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!!! 应该可以通过微积分算出来的 ttlegyq 发表于 2013-4-6 18:36 static/image/common/back.gif
什么是重力？就是万有引力。
那么当你在地心时，你就时个点，没有质量，那么你对地球没有引力，那这个时候 ...
谢谢以上各位的指点！
我还是认为，要计算没有问题，关键是如何界定。
看做是水球没错，看做是太空的卫星也没错。
地球也是一大球，也是漂浮在太空的，不妨我们缩小事物来观察下： 放到太空的水球，中间是什么压力呢？
有点害怕了，都搞上这层面了。
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