# P) n6 o% \' c! K! b 地球內(nèi)部的壓力決定于地層的厚度、平均密度和平均重力三個因素,。這樣,,從地表到地心的壓力,一直隨深度的增加而增加,。這一點與重力的分布不完全一樣,。但壓力增加的速度也因深度而有所不同。總規(guī)律是:接近地表和接近地心的層次,,壓力增加比較緩慢,,而在中間的層次,壓力增加得很快,。這是因為,,地表以下淺部位的巖層密度小而重力大,接近地心時物質(zhì)的密度大而重力�,�,;作者: 開水滋養(yǎng) 時間: 2013-4-6 18:22
萬物簡史 地球作者: ttlegyq 時間: 2013-4-6 18:36
什么是重力?就是萬有引力,。 : t3 O; a' I% ^& q. ^2 n3 y- C那么當你在地心時,,你就時個點,沒有質(zhì)量,,那么你對地球沒有引力,,那這個時候只有地球內(nèi)部的引力。4 ]7 ^! `2 _; N" t/ A
假設(shè)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(chǎn)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,。作者: 開水滋養(yǎng) 時間: 2013-4-6 18:43
內(nèi)部核心(inner core)壓力在330到360 GPa之間! j! ` ?7 V' O; x0 c4 j9 `7 U; D
參考:David. R. Lide, ed (2006-2007). CRC Handbook of Chemistry and Physics (87th ed.). pp. 14–13.作者: 開水滋養(yǎng) 時間: 2013-4-6 18:45 本帖最后由 開水滋養(yǎng) 于 2013-4-6 18:47 編輯 / K7 }7 _ e% m+ \$ z; D" X: J; w- H0 Z& W4 I5 |2 g
Temperature and pressure) G1 }2 m7 S, v% m F
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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]4 g1 I( b) s) l " R0 z& b# o+ g; l' C0 G
so ) I9 ^# N5 D1 O0 {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!!!作者: pacelife 時間: 2013-4-6 19:06
應(yīng)該可以通過微積分算出來的作者: 狙擊手 時間: 2013-4-6 19:17