Light Storm wrote:Re: SpearthrowerLight Storm wrote:With the above stated, EE does not need a change in Earth 'Mass' but presents one 'speculation' of a changing Earth Density.
Density is mass/volume. So you are suggesting that the volume increases while the mass stays approximately the same, leading to a less dense Earth? What process causes this? It's certainly not given by the same data as PT, which was your claim.
The inner core of the Earth is under a fair amount of pressure... 360 gigapascals. That's a lot of pressure. It's the kind of pressure that can transform density of solid matter into a significantly greater dense state. I'm not a physicist, but I've learned enough about it that when something can not compress any further, it begins to heat up. As it gets hotter... the molecules get more excited, and can be increased further in density.
Wrong. Density depends on mass and volume. Heat is just kinetic energy. The hotter a substance is the faster its molecules move, so they have more kinetic energy. In order for density to increase you need to do one of the following things:
1. reduce the volume without any change in the mass
2. increase the mass without any change in the volume
3. reduce the volume and increase the mass.
As long as the volume and mass are the same, density does not change. Now, you can compress something a lot, look at black holes, but in those extreme cases you need much greater masses, something like 3-4 solar masses (don't remember at the moment, and my books are at home).
Light Storm wrote:Speculation: What happens to this material if it looses heat? I suggest that as the Earth Cools from the outside in, it looses density over time forcing a molecular expansion simply because the molecules can not be that tightly packed in a cooler state. Without real core samples from the earth, this will forever be a 'guess'
NO. As I said, heat is nothing more than kinetic energy, which gets transferred to the outer layers, that's part of convection. The hotter material rises, it cools because as the molecules hit each other, they transfer the kinetic energy. (Look at collisions, both elastic and inelastic. In the case of atoms and molecules, most collisions are usually considered elastic), and then since they are slower, they sink, get heated again, and so on and so forth.
It's actually more complicated than this, and I am trying to use as simple physics as I can to explain this.
What happens when material cools down, is that it loses the kinetic energy, moves slower, and bonds between molecules and atoms form more easily. So, as material cools down it solidifies. Density may increase or decrease in such circumstances, depending on the volume, if we assume that the mass stays the same. For example, water when it cools and turns into ice, it actually expands, and so its density decreases. That is why ice floats on water; its density is less than its liquid form. Other liquids and gases, increase in density when they cool down, and solidify.
As for the rest, I am not going to comment because I think the whole expansion thing is total bollocks. There is no clear mechanism for expansion, no clear mechanism where the extra mass/energy comes from, and I am again repeating myself, with questions that are still unanswered.
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Isn't that contradictory to what you are arguing for?
