To learn more about this topic, start your googling with these keywords:


Decibels (dB): a unit used to measure changes in pressure or power.

Loudness: the intensity with which a sound is perceived.

Weighted decibels (dBA): decibels that try to take into account our sensitivity for different frequencies to better approximate loudness.

Frequency: the rate at which something occurs. In the context of sound it usually means 'sound waves per second'.

Audible: perceptible for the human ear.

High sound: a sound that has a high (fast) frequency

Low sound: a sound that has a low (slow) frequency

Resonance: When multiple things have a similar frequency they will tend to move together and amplify each other.

Echolocation: Using sound to "see". Bats use this to hunt in the dark.

Equal loudness contours: Curves that show the sensitivity of the human ear along the frequency spectrum.


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