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Simple Experiment Uses Salt To Create Sound Waves You Can Actually See

We all know that Superman can travel faster than the speed of sound, but do you know exactly how fast that is? In the right conditions, sound travels at the rate of approximately 5 miles per second. That means that Superman would be able to travel from New York to Los Angeles in less than 8 minutes! When airplanes travel faster than the speed of sound, also known as Mach 1, the breaking of the sound barrier creates a phenomenon known as a sonic boom. This occurs when the sound waves crash into each other, and sounds similar to a loud explosion. Sound must travel through matter in order for its characteristic vibrations to occur. Since outer space is a vacuum that is free of matter, it is the quietest place in the universe!
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