Why does air transmit sound, and how does sound travel in air and water?

The essence of sound transmission is sound waves (a type of mechanical wave.

Sound is produced due to vibration, mechanical vibration is transmitted in the medium is called mechanical wave), the process of sound waves advancing in the air is transmitted between adjacent air particles, just like a relay race, starting from the point of generation of the sound source, the ** of the previous particle drives the ** of the next particle (of course, the air particles do not follow the sound wave forward) Such a series of drives, sound waves are generated, and mechanical vibration is such that the sound source point propagates to the receiving point. It's like pounding billiards, the white ball is placed in front, and the other balls are placed in a row behind the white ball, and the white ball is hit with a rod, this process can be imagined as vibrating to produce a sound, and then the white ball hits the next ball, and the next ball hits the next ball ......This is the vibrational propagation process, which is also the energy transfer process. There is something inappropriate about this example, but this is how the propagation takes place.

Hope it helps. To put it simply, air transmission is because there is a sound transmission medium in the air, and the hand vibration is transmitted along the chain of medium particles in the form of mechanical waves.

The essence of sound is the reflection of vibrations in the brain through the human ear. The vibration of the sound-emitting object causes the vibration of the surrounding air molecules, and the vibration of these air molecules drives the vibration of the neighboring air molecules--- so that sound waves are formed. In the same way, solid liquids can also transmit sound, and because of the dense solid-liquid substance, vibrations are more likely to propagate, so the sound transmission performance of solid liquids is much better than that of air.

According to the theory of the origin of the earth, the sea is the cradle of all living things, and human beings evolved from the lungs that crawled out of the sea in wet stripes. The world in the sea is fascinating and mysterious. There, the sound reverberates briskly, and the sound seems to come from all directions, making it difficult to distinguish the direction of the person (like a diver).

The speed of sound waves in the air is about 340 meters and seconds, and there is a difference in the time it takes for sound (except for those coming from the front and the back) to reach the two ears. However, the propagation speed of sound in seawater is about 1500 meters and seconds, which is more than 4 times that of air, so a certain sound that can be identified in the air (that is, the time difference between the sound reaching the two ears can be recognized) is almost transmitted to the two ears at the same time in the seawater, and the time difference between the two ears is very small (less than 1 4 in the air), and the human ear is indistinguishable. For example, the sudden sound of a steamboat is like a buzzing saw in the water to a diver in the ocean, which can be heard from a long distance, but it is impossible to tell in which direction the steamboat is.

Sound seems to travel far and far in the air without much hindrance, and even less in the water and can travel farther. However, it is quite difficult for sound to propagate from the air to underwater, as soon as it touches the surface of the water, it is almost completely reflected back, and only about one-ten-thousandth of the sound can continue to be transmitted by the sound, so the vast majority of the sound from the sea surface is inaudible underwater.

There are the following examples of how sound can travel through the air:1. Singing in the classroom, which can be heard outside the classroom.

2. The sound of car and train horns comes to our ears.

3. The village horn sounded, and we could all hear it.

Acoustic propagation is transmitted through a medium. Due to the vibration of the object, sound can be produced, and sound is the fluctuation caused by the vibration of the spine of the substance, which needs to be transmitted by the medium to be heard.

The speed at which sound waves are transmitted in a medium is called the speed of sound (or speed of sound), and the reflection and refraction of sound occurs due to the different speeds at which sound travels in different media. Sound is produced due to the vibration of objects, and sound is a fluctuation caused by the vibration of matter, which needs to be transmitted by the mediator to be heard.

In the 18th century, scientists experimentally confirmed the idea that sound waves need air and other permeable substances to transmit them. About 1,700 years ago, the Italian scientist Torricelli proposed the idea that sound is transmitted through air.

In a vacuum, there is no way for sound to travel.

Sound is produced by the vibration of an object, and the object that is emitting sound is called the sound source.

Sound is simply the movement of pressure waves through the air. Pressure waves vibrate the small bones of the inner ear, and these vibrations are converted into tiny electronic brain waves, which are the sounds we perceive. The inner ear works on the same principle as a microphone captures sound waves or a speaker's articulation, which is the relationship between a moving mechanical part and air pressure waves.

Naturally, when the sound wave is pitched low, moving slowly, and loud enough, we can actually "feel" the air pressure wave vibrating the body. So we perceive sound with the mixed parts of the body.

Therefore, if there is no air, there will be no vibrations, so it will not be able to propagate.

No.

1. The propagation of sound requires a medium, and sound cannot be transmitted in a vacuum. Sound travels at different speeds in different media, but in general, sound travels faster in solids, followed by liquids, and slowest in gases.

2. Due to the different amplitudes of vibrating objects (vibration sources), the loudness of different sound emitters is different.

3. Due to the different speed (frequency) of the vibration of the vibrating object (vibration source), the tone of the pronunciation of different sound emitters is also different, and the vibration frequency of the sound source is large, the tone of the sound is high, and vice versa. It should be noted that the average person's hearing has a certain frequency range, and ultrasound above 20,000Hz and infrasound below 20Hz cannot be heard by ordinary people. So we can't assume that an object is not making a sound because it is not heard.

4. The quality (timbre) of the sound of different sound emitters is different, so although the loudness and pitch of the first sound object are the same, we can still distinguish them, that is, it is purely because of the different timbres.

5. Noise pollution is one of the four major pollutants in the world today, so noise should be controlled as much as possible in daily life and work, and noise control should be considered from the three links of sound elimination, sound insulation and sound absorption.

Sound is propagated by the vibrations of molecules in a medium, so in a vacuum where there is no medium at all, such as a gas, liquid, or solid, sound cannot propagate, i.e. sound cannot propagate in a vacuum.

In space, sound is likewise unable to travel due to the almost vacuum. Humans can't hear in space. In some closed vacuum chambers, due to the presence of air pressure, the sound may be transmitted to a certain extent.

For example, in a vacuum tank in a demonstration room, if air is pumped out to create a certain low-pressure environment, a small amount of sound will still be produced when the container is struck, but the distance and amplitude of sound propagation are very limited.

Therefore, it can be said that sound cannot travel in a vacuum. Sound waves need a closed medium to propagate, and without a medium there is no sound.

Sound is transmitted by the vibrations of molecules in a medium (e.g. air, water, or solids), so in a vacuum where there is no gas or other medium at all, sound waves cannot propagate, and there is no sound. In space, due to the almost vacuum environment, sound cannot be transmitted, and humans cannot hear sound in space.

However, in some enclosed vacuum chambers, sound can still be transmitted due to air pressure. For example, when a certain low-pressure environment is formed in the container, a hammer striking the container will produce a small amount of sound, but the range of sound propagation is very small, and it is very difficult to detect. Therefore, under certain conditions (such as a low-pressure environment), sound may propagate in a vacuum, but in general, sound can only propagate in a medium, and cannot propagate in a vacuum.