Sound by nature is very interesting and deserves attention.For a long time many scientists have wrestled with different puzzles, gradually unraveling all its secrets.We are literally surrounded by the sounds and the deep and absolute silence for us as unnatural and sometimes harmful, as well as a loud sound.At the same time the sound waves can affect the surrounding objects and human, sometimes this influence can be dangerous and harmful, but in some cases it can be used for good.It is only necessary to understand what the sound pressure.
sound is the result of fluctuations in the particles, generating sound waves.In a certain sense, these waves can be considered resilient, they can produce certain mechanical vibrations in the medium through which they pass.This is referred to as impact and pressure.A person can perceive it with their senses, it is sometimes quite tangible, to feel it fully.
When a sound wave passes through a certain environment, it will generate in it an excess pressure caused by the specific influence of oscillating particles.Each environment has its own inner pressure, and sound waves, usually can not exceed it.
sound pressure and sound pressure
There are two concepts in the definition of an ever there is confusion, it is the sound pressure and sound pressure.With the first concept we have sorted out the above - it is the pressure that occurs in a certain environment when passing through sound waves.Sound pressure - the pressure felt by the subject, placed in the zone of the loud sound.
These two concepts are similar, but the difference is only where there is one or the other thing.These terms not only have a few different definitions, but they are also bred to each other as in scientific experiments and in the domestic sphere.
Characteristics SPL
As is known, the speed of sound may vary depending on the particular circumstances and environment.This should be taken into account in the study of various phenomena, especially when the sound pressure is studied.Since the sound wave is constantly in motion, and pressure is also changeable.This kind of instantaneous magnitude, however, is taken in the study of a mean value.
study of this phenomenon leads directly to such a concept as the sound pressure level.Scientists have long made up a scale on which are guided in determining the impact of sound, as well as its potential threat to humans, which is designed to determine the sound pressure meter.
limit for human noise level is 120 dB when the pressure reaches a certain average pain threshold above which the attack may have injuries.This is the sound of a jackhammer working in close proximity to humans.
At 140 dB person begins to experience pain, it can happen trauma of the inner ear.This noise can be compared to those who had undergone the person who is at a distance of 25 meters from the soaring fighter.Already 150 dB threaten human contusion and loss of orientation, such noise publishes a Russian Soyuz rocket at a distance of 100 meters.Another 10 dB, and the noise level is comparable with a shot from a gun at close proximity to the human ear.Instant injury and rupture of the inner ear concussion.
If a person will experience the sound pressure close to 200 dB, it could be fatal for him, because in this case, it becomes equal to atmospheric pressure, which means that a person can happen rupture of blood vessels, lung injury, etc.250 dB - sound pressure level, comparable in strength to the shock wave in the explosion.A 282 dB roughly comparable to the air pressure, arising from a nuclear explosion.
