A world without sound would be strange and silent. We wouldn't be able to enjoy music and people would find it difficult to communicate. It would be boring. Sound helps us in many different ways, but what is sound?
Sound is like when you drop a rock into a puddle and the ripples go in all directions. When an object vibrates and then the sound molecules move and go into your ear. When the air molecules moves into your ears then the ear drum starts vibrating. It makes electrical signals to your brain. This tell your brain what the sound is.
How is sound different? When a sound wave vibrates fast it has got a high pitch. When a sound wave vibrates slowly it has a low pitch. How fast a sound wave vibrates is called its frequency. Frequency is measured in Herz.
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