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Science_Lab_Yellow / Lesson 9: How Fast Is Sound?

How Fast is Sound

What will we be learning today?


  • In this lesson, we are going to learn all about how fast is sound.


How Fast Is Sound?


  • It takes almost no time for an echo to bounce back to you after you yell "hello!" Sound waves travel fast. In air at room temperature (20 C), sound waves travel 343 meters per second, faster than most jet planes. In general, sound waves have a greater speed in a solid than in a liquid, and a greater speed in a liquid than in a gas.


The speed of sound waves depends largely on the molecules of the material-on how tightly packed molecules are and how easily they spread apart and move together. Temperature affects the speed of sound. In general, temperature affects the speed of sound more in gases than in liquids and solids.




Let's Review What We Learned Today!


  • Now complete your worksheet!