[FDArchitects]

SOUND
Sound is a vibration in an elastic medium  such as air, water, most building material and earth  

HEARING
Hearing, or auditory perception, is the ability to perceive sound by detecting vibrations changes in the pressure of the surrounding medium through time

Amplitude
Amplitude is the size of the vibration, and this determines how loud the sound is. larger vibrations make a louder sound
Amplitude is important when balancing and controlling the loudness of sounds, such as with the volume control on your music player.

Frequency
Frequency is the speed of the vibration, and this determines the pitch of the sound.  

Frequency is measured as the number of wave cycles that occur in one second.  The unit of frequency measurement is Hertz (Hz for short).









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