What's sound and why is so important?
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid.
In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
In our world, every move generates a sound, sometimes we can hear it, sometimes not.
Which are the elements of sound?
Sound has four elements or characterists:
Pitch is the perception of the frequency of the sound experienced, and is perceived as how "low" or "high" a sound is. It's measured in Hertz (Hz)
Intensity, or dynamics, is how loud or quiet a sound is and includes how stressed a sound is or articulation. It's measured in decibels (dB)
Timbre is the quality of a sound, determined by the fundamental and its secondary vibrations. It allows us to difference the same note on different instruments.
Duration is how long a sound can be. Normally, it's measured in seconds (s).