Speed of Sound

We just learned about Sound Waves.

When sound travels through the air, it moves very very fast, about 760 miles per hour!
That's faster than you can see, faster than you can run, and faster than any normal car you drive on the street!

Jet airplanes can go faster than the speed of sound, and when they get past that speed they make a big noise called a sonic boom.
Going faster than the speed of sound is called breaking the sound barrier.

(from: wikipedia - sound barrier

The first person to break the sound barrier in a jet was Chuck Yeager in the Bell X-1 jet on October 14, 1947.

(from: wikipedia - chuck yeager)

Sound waves

We just learned about Positive and Negative sides of batteries.

When you make a sound, like plucking on a guitar string, it makes a vibration that pushes through the air.

(from: wikipedia - seven strings guitar)

Those invisible vibrations in the air are called sound waves and if you could see them you'd see they look a lot like the waves you see in the water.

(from: wikipedia - sound waves)

The waves travel through the air until they hit your ear, then you hear the sounds!

(from: wikipedia - ear)