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Vacuum tube

In electronics, a vacuum tube, electron tube (in North America), tube, or valve (in British English) is a device controlling electric current through a vacuum in a sealed, usually glass, container. Th ...

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Speed of light

The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its value is exactly 299,792,458 metres per second, a figure that is exact becaus ...