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  1. The speed of light in vacuum, commonly denoted c, is a universal physical constant that is important in many areas of physics. The speed of light c is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).

  2. en.wikipedia.org › wiki › Light_metalLight metal - Wikipedia

    A light metal is any metal of relatively low density. More specific definitions have been proposed; none have obtained widespread acceptance. Magnesium , aluminium and titanium are light metals of significant commercial importance. [2]

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