The idea that something so intangible can lift objects can seem unbelievable, but it's a real phenomenon. Learn how acoustic levitation takes advantage of the properties of sound to cause solids, liquids and heavy gases to float. See more »

What makes sound a weapon? Review the basics of sound and discover exactly how the LRAD produces its "beam of sound." We'll also explore LRAD's hailing and warning abilities and other uses for sound. See more »

Radar seems to have infinite uses: Police use it to clock your speed, NASA uses it to follow satellites, meteorologists use it to track storms and the military uses it to track the enemy ... Learn all about radar technology! See more »

Pianos lose their tuning, guitars fall out of key -- even church organs need to be tuned every now and then. For centuries, the only sure-fire way to tell if an instrument was in tune was to use a tuning fork. See more »

A sonic boom occurs when a vessel breaks the speed of sound. So what is this infamous sonic boom, if not the shattering of the picture-window-in-the-sky? See more »

I was watching an old movie today, and two kids (neighbors) were talking to each other using two tin cans and a string. Does that really work? If so, why does it work? See more »

Did you ever wonder how to measure how fast sound travels in the air? Read this article to learn how to measure sound travel in the air. See more »

Noise, unwanted sound. Whether or not a certain sound is referred to as "noise" depends on the viewpoint of the listener. See more »

Sound. When a drum is struck, the drumhead vibrates and the vibrations are transmitted through the air in the form of waves. See more »

Ultrasonics, the branch of physics and engineering dealing with highfrequency sound waves. See more »