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The speed of light in vacuum, often called simply speed of light and commonly denoted c, is a universal physical constant exactly equal to 299,792,458 metres per second (approximately 1 billion kilometres รขโฌยฆ The speed of light in a vacuum is a fundamental universal constant, commonly denoted by รขโฌหcรขโฌโข. The value of the speed of light is exactly equal to 299,792,458 meters per second, which is approximately equal รขโฌยฆ
Speed of light is defined as the speed with which a light photon travels in a vacuum. The speed at which the light wave propagates through different materials is known as the speed of light. So, the speed of light will vary depending on the medium it propagates.