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DIY: Shure Sound Isolating Earphone + iPhone 4 Earphone by Yutaka Tsutano on Flickr

  • Are mechanical waves that are movements of pressure transmitted through solid, liquid and gas.
  • Sound is produced by anything that vibrates or changes air pressure quickly.
  • Sound is transmitted through gases, and liquids as longitudinal waves which are also called compression waves.
  • A compression wave is when the particles in a wave are close together and not spread out.

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Diagrammatic View of the Earby perpetualplum on Flickr

  • The mechanical vibrations that can be interpreted as sound are able to travel through all forms of matter: gases, liquids, solids, and plasma.
  • Sounds come in the form of sound waves.
  • These waves are caught in the outer ear 
  • Then they travel through the ear canal into the eardrum.
  • Sound waves vibrate the eardrum
  • Then the sound moves into the inner ear
  • Then the hairs inside the inner ear vibrate.
  • This movement sends signals to the brain, which immediately interprets the sound into whatever it may be.

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I Giovani e la Musica by superUbO on Flickr

  • Sound can be transmitted as both longitudinal waves and transverse waves through solids. 
  • Longitudinal waves are waves that have the same direction of vibration as their direction of travel. 
  • Transverse waves are waves that are moving perpendicular to the direction of the waves. 
  • Sound can travel as fast as 1500 meters per second. 
  • Sound travels faster in liquids than in solid.

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