Lesson 4 of 4 ยท Grade 6 Science and Technology
Sound
12 min
Sound is produced when objects vibrate (move back and forth quickly).
How sound travels
Sound needs a medium to travel through: a solid, liquid or gas. It cannot travel through a vacuum (empty space).
- Sound travels fastest in solids, slower in liquids and slowest in gases.
- That is why you can hear a train coming by putting your ear on the rail.
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