The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air at 20 Â°C (68 Â°F), the speed of sound is 343.2 metre per second (1,126 ft/s). This is 1,236 kilometres per hour (768 mph), or about one kilometer in three seconds or approximately one mile in five seconds.
The now retired Concorde turbojets were the fastest civilian airliners in the world, capable of carrying passengers from Paris to New York in just 3.5 hours, traveling at supersonic speeds. However, lack of market appeal, combined with high maintenance costs, lead to its regrettable retirement from service with no civilian airliner to replace it, not even to [...]
At 300,000 kilometers/second, the speed of light is constant in vacuum, such as space, when it encounters a different medium, however, such as glass or water, its speed is reduced. Another phenomena that can occur in addition is that light can be dragged when it travels through a moving substance, and scientists at University of [...]