High pressure
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High pressure science and engineering is studying the effects of high pressure on materials and the design and construction of devices which can create high pressure. By high pressure it is meant pressures of thousands (kilobars) or millions (megabars) of times athmospheric pressure (about 1 bar).
It was by applying high pressure as well as high temperature to carbon that man-made diamonds were first produced as well as many other interesting discoveries. Almost any material when subjected to high pressure will compact itself into a denser form, for example, quartz, also called silica or silicon dioxide will first adopt a denser form known as coesite, then upon application of more temperature, form stishovite. These two forms of silica were first discovered by high pressure experimenters, but then found in nature at the site of a meteor impact.
High pressure experimentation has led to the discovery of the types of minerals which are believed to exist in core of the Earth, such as perovskite which is thought to make up half of the Earth's bulk.
Further Reading
- The New Alchemists: Breaking Through the Barriers of High Pressure, Robert M. Hazen, Times Books, Random House, 1993, hardcover, 286 pages, ISBN 0-8129-2275-1