In physics, superheating (sometimes referred to as boiling delay) is the phenomenon in which a liquid is heated to a temperature higher than its standard boiling point, without actually boiling. This can be caused by rapidly heating a homogeneous substance while leaving it undisturbed (so as to avoid the introduction of air bubbles at nucleation sites).
Because a superheated fluid is the result of artificial circumstances, it is metastable, and is disrupted as soon as the circumstances abate, leading to the liquid boiling very suddenly and violently—a very dangerous situation. Superheating is sometimes a concern with microwave ovens, some of which can quickly heat water without physical disturbance. A person agitating a container full of superheated water by attempting to remove it from a microwave will likely be scalded.
Video of superheated water in a microwave explosively flash boiling. (http://apache.airnet.com.au/~fastinfo/microwave/videos/H2O-2-divx5.avi)
A series of superheated water with oil film experiments done in the microwave by Louis A. Bloomfield, physics professor at the University of Virginia. Experiment #13 proceeds with surprising violence. (http://howthingswork.virginia.edu/movies/shw128k.rm)
The SuperH family was first developed by Hitachi as the successor to the H8 Family and the design was outsourced to the newly-formed SuperH Inc., owned by Hitachi and ST Microelectronics.
The SuperH architecture, including the new 64 bit SH-5 core architecture, will be supported by the Red Hat Embedded Linux developer suite enabling developers to gain access to the latest software upgrades as they become available and to Red Hat Open Source Support.
Currently SuperH, Inc is seeking partners to license its high-performance, low-cost, power efficient SH-4 core, which is targeted at the next generation PDA market, the set-top-box sector, the games console sector and the automotive sector.
Looking to the future SuperH, Inc. will develop all subsequent SuperH cores to the open market, including the development of the soon to be launched 64-bit SH-5 processor as well as future SH-6 and SH-7 cores, due to be unveiled over the next two years.
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