Do Ice Core Scientists understand That Huge Pressures in Ice Sheets?

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Do ice core scientists understand that huge pressures in ice sheets mean they are essentially fluid so short-term peaks in gas contents will be erased even in fully compacted ice?

It’s very interesting. Ice VII exists under conditions that cannot be reproduced in a lab. It is just a theoretical definition. It is thought to exist in the depths of Titan. Looks like it will stay away from us for some time. The optical properties could be calculated having in mind the crystalline structure of ice VII. See . - Refraction index. The refractive index and electronic gap of water and ice increase with increasing pressure - I was wrong about not being produced in a lab. What the heck is 'ice VII,' and why are scientists using lasers to make it?

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For most of us, those who study chemistry, it takes us a few years to understand that the physical properties of water and ice aren't just defined by the pressure that we can apply to them, but by the crystalline structures of those molecules. I didn't really think of it that way until I started reading about it in more detail. Refraction is the bending of rays and waves as light waves pass through medium (we call it light). If that's true, then if I have a wave or a wave front passing through water, I would expect the angle of refraction of the light to be the same. So why couldn't that be true with ice IV, even if we're looking at it under laboratory conditions? To answer that, we need to understand a little about pressure. Pressure, in fact, is actually a combination of temperature, relative.