Speed of light in vacuum: The speed of light in vacuum is

The speed of light in vacuum is 3 × 108 m/s. The vacuum is a space where there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. Around 1676, Danish astronomer Ole Roemer became the first person to prove that light travels at a finite speed. CODATA Value: speed of light in vacuum speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second. The speed of light, commonly symbolized by the letter c , is a fundamental constant in the realm of physics. It refers to the speed at which light photons travel in a vacuum and is measured in the SI unit of m/s . The value of c is a constant throughout the universe and plays a significant role in various physics disciplines.