Sound is a sequence of moving particles in progression.
It’s caused from a sound source, the spurts out from an original encounter, that determines a longitudinal pressure that, exciting progressively the particles, develops as a centripetal mechanical oscillation that goes fading around a balance spot.
It’s made of 3 characteristics:
- Intensity
is the volume of sound, that equals the propagation force. It increases in relation to the wave amplitude:
higher sound lower sound
it depends on the relation between the energy per unit of time shed the density of the surface invested: I= W/S (in which W is watt and S space).
- Height
allows to distinguish high from low sounds: depends on the frequency of the wave.
In practice a sound is more acute more faster is the complete oscillation of the wave.
- Stamp
is what distinguishes a sound from another.
It depends on the form of the wave: not every sound is produced with a constant intensity but, between a more acute sound and the other, there are sinusoids of different magnitude
that we define harmonics (shades, colours).
The sound is due to the vibrations of elastic bodies (said means) and propagates in the form of concentric waves.
They develop different speeds depending on the density (the molecular ratio) of the medium.
The propagation speed increases exponentially to the decrease of temperature and increase of density (humidity).
In fact, sound travels faster in water than in the air because the molecular relationship is more dense.
If in the air (composed of different substances including nitrogen, oxygen, helium, iodine …) the waves develop more discontinuously, in the water the density is greater, therefore the movement is more fluid.