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地球的核心失去热量吗?

将所有的钻井和挖掘使用地球的自然热地热能源影响地球的核心,使其降温?

如果是这样的话,它会导致一个冰河时代?如果不是这样,地球的核心如何保持其热吗?

回答

>所有的钻井和挖掘使用地球的自然热地热能源会影响到地球的核心,使其降温?是的。但多少?让我们做一些粗略的数学。我们在这里只是关心数量级。假设我们有一个统一的地球的大小范围。叫它10 <一口> 21 < /一口>立方米。假设这球是由岩石构成的,这是密度比水的四倍。水重1000千克每立方米。当然地球不是制服; it is made up of rocks that are less dense and metals which are more dense. We're doing some rough math here. And let's suppose that the interior of our planet is of uniform temperature, say, 5000 Kelvin. Again, of course the Earth is not uniformly hot throughout. Again, we're doing rough math here, just to get an idea of the order of magnitude involved. Let's suppose that our ball of rock is not producing new heat. Of course the Earth is producing new heat inside it, for instance, from radioactive elements in the core. But let's suppose that it is not. And let's suppose that our ball of rock has a specific heat capacity of 0.8 joules per kilogram * kelvin. The specific heat capacity roughly speaking tells us how much energy is in some amount of a substance at a particular temperature. So multiply that out. (1021 cubic meters) x (4000 kg / cubic meter) x (5000 kelvin) x (0.8 Joules per kilogram * kelvin) = 1.6 x 1028 joules We're just looking for an order of magnitude here. Our ball of rock has roughly 1028 joules of thermal energy. Now let's suppose that we extract some amount of those joules. Total energy consumption of humanity from all sources -- nuclear, gas, etc -- is about 1018 joules per year. If we got 100% of that from our ball of hot rock, it would cool it off by one-ten-billionth of its total heat every year. That's making the worst possible assumptions; of course we do not get anywhere even close to all our power from geothermal, the energy we do get was just going to be wasted into the atmosphere eventually anyway, the earth does make its own heat, and so on. We could get our total power needs met by geothermal energy for *trillions* of years without worrying about cooling the core. > how does it retain its heat? The same way anything other ball of rock retains its heat. Heat, like all forms of energy, is retained indefinitely until something acts to remove it. I'm not clear on what question you're actually asking here.

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\ begingroup美元 “热,像所有形式的能源,无限期保留直到徒删除它。”什么?没有热量通过辐射损失不断降温。 \ endgroup美元
- - - - - -约翰
2020年5月7日,在2:56吗

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