Sound is a form of energy. Being able to hear sound is one of our most important senses. Some of the sounds you hear are loud and some are soft. This is the intensity of the sound. Sounds can also be high or low. This is the pitch of the sound.
Sounds are made by something moving backwards and forwards. This is called vibrating. When you speak, vocal cords in your throat vibrate. When you play a guitar the strings vibrate to produce the sound.
Sound waves travel through the air. The air particles squash up and move apart! Sound can even travel through liquids and gases because the particles pass on the vibrations. Sounds travel fastest through solids, and slowest through gases.
- Sound travels in all directions.
- Sound travels in waves.
- Sound is made from vibrations.
- Sound can be reflected, we call this an echo.
- Sounds get louder as they closer and then fainter as they get further away.
- Sounds travel to our ears.
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To learn about sounds in underwater visit http://www.divediscover.whoi.edu/expedition12/hottopics/sound.html