Sound waves with a frequency.

Sound waves with a frequency lower than the human lower extremity (usually 20 Hz) are called inaudible sounds. It is also sometimes called audible sound, low frequency sound, and so on. In English it is called "Infrasound". As the frequency of sound decreases, the human auditory canal becomes less sensitive, so that the pressure of sound has to be high enough for people to understand inaudible sounds. The ear is the primary organ of inaudible sound sensation, but it is possible to feel inaudible vibrations in different parts of the body at higher intensities.

The branch of science that studies obscure words is called infrasonics. It studies words ranging from 20 Hz to 0.1 Hz (rarely 0.01 Hz). Within this frequency range, scientists observed the activity of earthquakes and volcanoes, mapped the rock and mineral deposits beneath the surface, and even studied the functioning of the heart.

The Allies of World War I used the first inaudible term to identify artillery. One of the pioneers of the study of inaudible words was the French scientist Vladimir Gavrio. His interest in audible sound waves first arose in his laboratory in the 1960s, when he and his laboratory assistants experienced shaking laboratory equipment and pain in the ear, but this was audible in his microphoneCould not detect word.Eventually he came to the conclusion that it was caused by a huge fan and duct system in the laboratory and soon began testing it in the laboratory. He named it Unforgettable. His experiments included making an inaudible sound with an inaudible whistle and a large organ tube.

Human hearing range from 20 Hz to 20,000 Hz. We do not hear any sound below 20 Hz. Our other senses and the brain just feel its vibrations even when we can't hear. The effects of this inaudible sound can cause discomfort, shadows in front of the eyes, or nausea. And seeing this discomfort or shadow in a haunted environment suddenly causes intense panic which is often referred to as ghosting. Inaudible sounds can also occur naturally in stormy weather, during thunderstorms, in strong winds; At times when ghosts are usually heard.

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