How many decibels is the sound in the library reading room?

The sound of libraries and reading rooms is about 20 decibels to 30 decibels.

Decibel is mainly used to measure sound intensity, and is often expressed in dB. Internationally, the measurement standard of decibel size has the following standard ranges:

1 dB is the volume of the sound that can be heard just now, 30 dB is the volume of whispering, 60 dB is the volume of normal conversation between two people, 85 dB is the volume of the car on the road, 100 dB is the volume of the decoration electric drill, and 120 dB is the volume when the plane takes off.

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