Noise is a chaotic mixture of different sounds.Physical characteristics are its volume decibels.They indicate the degree of sound pressure.
noise level for a human being in the natural limits is from twenty to thirty decibels.This volume is not able to do any harm and is considered comfortable.For example, such a noise issue rustling the leaves on the trees.However, each person gives the individual preferences of a certain level of ambient sounds.There are people whose performance falls sharply if there are too quiet.To eliminate the discomfort they may include background music.The silence must be broken for others only the ticking of the clock.
noise level, measured at a distance of two meters from the property, according to the health recommendations, should not be above fifty-five decibels.This is the sound of a normal conversation between people or boiling kettle on the stove (if you are from a half a meter).
In large cities the observance of these standards is not possible.This is facilitated by a lively motorway and new construction.The noise level in decibels from a passing car near you will be about seventy.Motorcycle, bus and truck cause us even more discomfort.Their noise levels reach the border ninety decibels.Thus, passing along the highway, the man picks up the sounds that greatly exceed health standards.
Noise stations and airports in our lives is the maximum.Trains and planes are able to make sounds, the volume of which reaches the limit of one hundred decibels.
Elevated values of the background noise are dangerous to human health.If our bodies are constantly in the act of hearing sounds in excess of eighty decibels, such a situation is considered to be harmful to the body.Employees who work in such production conditions must periodically give direction to medical examination.
noise level has come down to the border of a hundred and thirty decibels can cause physical pain.Marking one hundred fifty causes loss of consciousness.One hundred and eighty decibels destroy metal and lead to death.Fortunately, the everyday reality of such pressure level is extremely rare.
In order to understand how environment is harmful to your health, you need to resolve the question of how to measure the noise level.For this purpose there is a special device, available in different versions.It is called the sound level meter.In order to measure the volume of evidence in a residential area, there are domestic, and industrial - industrial devices.Available in a wide range of sound level meters and who are able to grasp the level of infrared and ultrasound.
Ton, located within the boundaries of high and low frequencies are perceived as more quiet.The sound level meter is equipped with a special electronic filter which modulates the various indicators and standardizes measurement.
Constant loud noises reduce our ears.Loud noises can become a cause of receiving the acoustic trauma.This pathology can be acute or chronic.The first kind of injury can be obtained from the sharp sounds that sounded very close to the ear (the horn of a passing train, the roar of an installation).The consequence of such exposure can be:
- pain in the ear;
- internal bleeding;
- swelling and displacement of the cells located in the inner ear.
Over a period of a person think that deafness occurred.Sometimes loud sounds can cause rupture of the tympanic membrane.
With continued long-term stay in a noisy environment there is a chronic acoustic trauma type.Its consequence is the dullness of hearing.
