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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