What's the sound of thirty degrees?

The sound of 30 decibels is probably the sound when people speak softly. The sound of 30 decibels does not affect people's rest. It's a relatively quiet sound, which can be regarded as a relatively quiet environment.

Other volume decibel tables are as follows:

1, 1 dB: It's just an audible sound.

2./kloc-below 0/5 db: It feels very quiet.

3, 30 decibels: the volume of the whisper.

4, 40 decibels: the hum of the refrigerator.

5, 60 decibels: the sound of normal conversation.

6, 70 decibels: equivalent to walking in the downtown area.

7, 85 decibels: on the road where cars shuttle.

8, 95 decibels: motorcycle starting sound.

9. 100 decibel: the sound of decorating electric drill.

10, 1 10 dB: karaoke, loud MP3, stereo.

1 1, 120 dB: the sound when the plane takes off.

12, 150 dB: the sound of fireworks.

The American Speech Hearing Association reminds that long-term exposure to 50 decibels of noise at night can easily lead to cardiovascular disease; 55 decibels will have a negative impact on children's learning; 60 decibels, people wake up from sleep; 70 decibels, the incidence of myocardial infarction increased by about 30%; Exceeding 1 10 dB may cause permanent hearing loss.

Extended data:

Definition of power level decibel

Decibel is a non-SI unit selected by the state, and it is a differential unit among the legal units of measurement in China. It is expressed in DB and defined as: "The common logarithm of the ratio of two similar power quantities or quantities equivalent to power multiplied by 10 equals to the differential of 1". At the same time, the "quantity equivalent to power" is explained in the Supplementary Explanation of Legal Units in People's Republic of China (PRC): "It usually refers to current square, voltage square, particle velocity square, sound pressure square, displacement square, velocity square, acceleration square, force square, amplitude square, field strength and sound energy density, etc." .