Decibel (decibel) is a unit of measurement for measuring the proportion of two identical units. It is mainly used to measure the sound intensity. It is often expressed in dB.
Decibel is the more commonly used unit of measurement. Can be expressed as:
1, a unit representing the ratio of power, which is commonly used to equal the ratio of power intensity
| 1 dB | Just heard |
| 15 decibels or less | Feel quiet |
| 30 dB | Whisper volume |
| 40 dB | Buzz of the refrigerator |
| 60 dB | Normal conversation voice |
| 70 dB | Equivalent to walking in the downtown area |
| 85 dB | Cars shuttle on the road |
| 95 dB | Motorcycle start sound |
| 100 dB | Decoration electric drill sound |
| 110 dB | Karaoke, play MP3 loudly |
| 120 dB | The sound of the plane taking off |
| 150 dB | The sound of fireworks |
American Speech and Hearing Association reminds: Long-term reception of 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 make people wake up from their sleep; 70 decibels, the onset of myocardial infarction The rate increases by about 30%; exceeding 110 dB may cause permanent hearing loss .
