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Author Topic: Diamonds are well hard aren't they ?  (Read 12382 times)

Offline neilep

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Re: Diamonds are well hard aren't they ?
« Reply #25 on: 14/10/2005 14:10:48 »
You'd have to use a nonotube/nanorod container to hold the liquid diamond goodness in.

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Offline johndiver

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Re: Diamonds are well hard aren't they ?
« Reply #26 on: 23/10/2005 23:27:35 »
Ok, enough about hard carbon, has anyone studied "hard water"? I'm not talking about the calcium compounds dissolved in drinking water in Canada, I'm talking about water-ice that's been compressed in cold anvils.
In the late 1940s, a researcher pondered "what kind of ice is at the bottom of a glacier?" So he attached refrigeration equipment to a hydraulic press, and squeezed a small block of ice until something went "snap" and the volume of the cube jumped down a notch. This new ice had a higher melting point.
The experiment was repeated. Again, the ice cube jumped to a smaller volume, then as more pressure was added, it decreased again. The limits of the press were reached and the experiment stopped.
In the mid-1950s, a more powerful press was assembled and the ice was once again compressed up to level 8, or ice VIII. This highly compressed ice was dark and hard as steel. Its melting point was never discovered, as it only got softer with higher temperatures.
A science-fiction writer realized that this Ice VIII had the potential to destroy life on  Earth. He reasoned that if ice VIII were released into the arctic it would grow as it attracted other water molecules into its unique structure. Unable to melt, the ice VIII mass would creep slowly across the ocean bottom, destroying a vital part of the ecosystem. Once created, it would be virtually impossible to reverse.
But .... before you run for the hills, remember that compressed ice likely lays at the bottom of the Greenland glaciers, as it has for centuries, but has not yet altered the biosphere. Ergo, the science was correct, but the fiction was ... well ... fiction.
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Offline Ray hinton

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Re: Diamonds are well hard aren't they ?
« Reply #27 on: 29/01/2006 00:24:05 »
if diamonds are so hard what do they cut them with ?.
is there some super-tough substance out there that us commoners are not being told about.
 

Offline neilep

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Re: Diamonds are well hard aren't they ?
« Reply #28 on: 29/01/2006 00:37:15 »
quote:
Originally posted by Ray hinton

if diamonds are so hard what do they cut them with ?.
is there some super-tough substance out there that us commoners are not being told about.




They actually use other diamonds to cut diamonds. Diamond tipped cutting tools.

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Offline Ray hinton

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Re: Diamonds are well hard aren't they ?
« Reply #29 on: 29/01/2006 01:48:46 »
thanks neilep for the welcome,if these diamonds are so hard,how come you dont see them with tattoos and shaved heads ? sorry, yes i know how they do it,diamond powder bonded to a wheel.
 

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Re: Diamonds are well hard aren't they ?
« Reply #29 on: 29/01/2006 01:48:46 »

 

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