Electromagnetic waves do not require a medium in order to transport their energy. Mechanical waves are waves that require a medium in order to transport their energy from one location to another. Because mechanical waves rely on particle interaction in order to transport their energy, they cannot travel through regions of space that are void of particles. That is, mechanical waves cannot travel through a vacuum. This feature of mechanical waves is often demonstrated in a Physics class. A ringing bell is placed in a jar and air inside the jar is evacuated. Once air is removed from the jar, the sound of the ringing bell can no longer be heard. The clapper is seen striking the bell; but the sound that it produces cannot be heard because there are no particles inside of the jar to transport the disturbance through the vacuum. Sound is a mechanical wave and cannot travel through a vacuum.

Sound have the mechanical waves because it required to move their medium (solid, liquid or gas)and sound always move in medium.

Sound is a mechanical wave because it requires a medium to travel through. Mechanical waves are waves that require a medium, such as a solid, liquid, or gas, to propagate or travel. They transfer energy by causing particles in the medium to vibrate.

Here is a detailed explanation:

Mechanical Waves:
- Mechanical waves are waves that require a medium to travel through. They cannot travel through a vacuum, which is an empty space devoid of matter. Examples of mechanical waves include sound waves, water waves, and seismic waves.

Sound Waves:
- Sound waves are a type of mechanical wave. They are produced by the vibration of an object, such as a tuning fork or a guitar string. These vibrations create compressions and rarefactions in the surrounding medium, which propagate as sound waves.

Propagation of Sound Waves:
- When an object vibrates, it causes the particles in the medium (e.g., air, water) to vibrate as well. These particles transfer the energy from the vibrating object to neighboring particles, causing a chain reaction of vibrations.
- As the particles vibrate, they create areas of compression and rarefaction. In the compression regions, the particles are closer together, while in the rarefaction regions, the particles are spread apart.
- This pattern of compressions and rarefactions travels through the medium as a sound wave. The particles themselves do not travel with the wave; they only vibrate in place.

Characteristics of Sound Waves:
- Sound waves have several characteristics, including frequency, wavelength, amplitude, and speed.
- Frequency refers to the number of vibrations or cycles per second and is measured in Hertz (Hz). It determines the pitch of the sound.
- Wavelength is the distance between two consecutive compressions or rarefactions. It is measured in meters (m) and determines the size or length of the wave.
- Amplitude is the maximum displacement of a particle from its equilibrium position. It determines the loudness or intensity of the sound.
- Speed of sound waves depends on the medium through which they are traveling. In general, sound travels faster through solids, slower through liquids, and even slower through gases.

Conclusion:
In conclusion, sound waves are mechanical waves because they require a medium to propagate. They transfer energy through the vibration of particles in the medium. Other examples of mechanical waves include water waves and seismic waves. On the other hand, light, radio waves, and X-rays are examples of electromagnetic waves, which do not require a medium and can travel through a vacuum.