1, through what does sound spread?

Analysis: sound is produced by the vibration of objects, and sound is the fluctuation produced by the vibration of matter, which can only be heard by the medium. Media includes all solids, liquids and gases. Generally speaking, the speed of sound in solids is the largest and that in gases is the smallest.

Due to the vibration of objects, sounds can be produced. Sound is a wave generated by the vibration of materials, and only the medium can hear it. The speed at which sound waves propagate in a medium is called the speed of sound (or sound speed). Because sound travels at different speeds in different media, the phenomenon of sound reflection and refraction will occur.

In the eighteenth century, scientists have confirmed the idea that sound waves need air and other media to spread through experiments. About 1700 years ago, Italian scientist Torricelli put forward the idea that sound travels through the air.

Extended data:

General characteristics

1, reflection

Because sound travels at different speeds in different media, it will be reflected and refracted. The phenomenon that sound waves cannot cross and return to the original medium when encountering obstacles is called reflection, and this phenomenon of sound wave reflection is also called echo. The reflection phenomenon of sound waves was proved by experiments as early as 1882.

2. Refraction

If sound propagates in different media, the phenomenon that the propagation direction is deflected due to different speeds is called refraction. For example: Midnight to the Passenger Ship. At night, due to the high temperature and high speed of sound near the sky, the sound waves will deflect downward when traveling, so the bell of Hanshan Temple will be transmitted to the passenger ship on the river.

References:

Baidu encyclopedia-sound communication