People use decibels to express the intensity of sound. (30 ~ 40 decibels) is an ideal quiet environment. In order to protect hearing, the sound should not exceed (90 decibels); In order to ensure work and study, the sound should not exceed (70 decibels); To ensure rest and sleep, the sound should not exceed (50 decibels).
Decibel is the unit of sound pressure level, which is recorded as d b. It is used to indicate the size of sound. 1 decibel is about the sound that people can just feel. The suitable living environment should not exceed 4 5 decibels and should not be lower than 1.5 decibels.
Extended data:
According to the hearing of ordinary people:
0-20 dB is very quiet and almost imperceptible.
20-40 decibels. Quiet, like a whisper.
40-60 dB general indoor call
60-70 decibels are noisy and harmful to the nerves.
Noise of 70-90 decibels is loud, and nerve cells are destroyed.
90- 100 dB noise increases and hearing decreases.
References:
Noise level-Baidu Encyclopedia