You hear sound every day. More than likely you are hearing something right now. But how does it work? The study of sound is a fascinating science. This instructable is designed to give you a basic understanding of how sound works. This instructable is more of a how it works as opposed to a how to. Once you understand how it works, it is much easier to learn the how to.
Please note that I am constructing this from a sound engineer's point of view. Most of the content is theory, so please keep that in mind when you read this.
Also, this is my first instructable, so please don't be too harsh. :)
Step 1: What sound is/air movement
Sound travels in waves. Almost all sounds can be created from, or reduced to a sine wave. You can see a very deep sine wave in the picture.
Sound is the movement of air. When you hear something, parts of your ear are vibrating. When you speak, your voice causes air to move, which causes parts in your ear and other people's ears to vibrate. Most microphones work in a similar way to the human ear. When sound travels across the diaphragm, it causes it to vibrate, and then convert into electricity (signal). A speaker works in the opposite way. When a speaker receives signal (electricity), it causes parts of the speaker to move back and forth which causes air to move. This way, it allows you to hear the sound.