Sounds above 90 dB can lead to chronic hearing damage if people are exposed to them every day or all the time. Above this threshold, sounds with higher sound pressure levels are heard as louder noises. Humans have a hearing threshold of around 0 decibels. This level name as an auditory threshold or hearing threshold. In order for us to be able to hear a sound at all, it has to be above a certain level. Among common environmental sounds, a refrigerator is 50 decibels, a ringing telephone is 80 decibels, a noisy restaurant is 85 decibels, and a subway is 90 to 115 decibels. The sound of normal breathing is 10 decibels, a soft whisper is 30 decibels, a normal conversation is 60 decibels, and shouting in the ear is 110 decibels. The decibel levels could be harder for us to exact estimate than distance or volume, many of the hearing organizations have developed helpful points of reference on the decibel scale. By the time when the decibel level reaches about 120 decibels, for example, the sound of a jet engine or ambulance siren, the intensity is 1 trillion times greater than the weakest audible sound. With an increase of 10 decibels, a sound becomes 10 times more intense twice as loud to our ears. This is the measurement of the softest sound that our ears can hear. The lowest level of the decibel is 0 at this level we can hear. Profound loss: 90 dB or more to the animal.Severe hearing loss: 70 to 90 dB higher than normal.Moderate-to-severe hearing loss: 55 to 70 dB higher than normal.
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