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  • Smart Learning for All

  • Topic: Sound.

  • Why can't we hear sound in space?

  • Do you know what sound is and how we are able to hear it?

  • Sound is a form of energy which creates a sensation of hearing.

  • It always needs a medium to travel.

  • In this case, air is the medium.

  • When we play songs, the diaphragms of the loudspeakers vibrate.

  • This makes the adjacent air molecules vibrate.

  • These vibrating air molecules pass on the vibrations to the nearby air molecules.

  • In this way, the vibrations travel from one point to another.

  • Eventually, when these vibrations reach our ears, they create a sensation of hearing.

  • Hey.

  • Did you see that?

  • He was able to hear sound through a solid metal box?

  • How is that even possible?

  • It is possible because sound can travel through solids also.

  • We know that sound needs a medium to travel.

  • That medium can either be a solid, liquid or gas.

  • Sound travels with the help of molecules present in the medium.

  • However, as compared to liquids and gases, the molecules of solids are very closely packed together.

  • Hence, when molecules of a solid vibrate.

  • They pass on the vibrations to the surrounding molecules more effectively.

  • Thus, we can conclude that sound travels more effectively through solids.

  • As compared to liquids and gases.

  • So, why wasn't he able to hear the sound?

  • This is because when the air is completely removed.

  • An empty space devoid of any air, that is, a vacuum is created.

  • Vacuum does not have any kind of medium.

  • That means it does not have any molecules.

  • As there are no molecules that can vibrate and transmit sound, vibrations cannot reach his ears.

  • Thus, he does not get a sensation of hearing.

  • Similar phenomenon takes place in space as well.

  • Space is also a vacuum.

  • It does not have any medium.

  • Thus, we can't hear sound in space.

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