Sound
Vibration of air molecules produces sound waves. These waves are propagated through the air as differences in pressure, which our ears can detect as sound.
Vibrating gasses, like air, produce longitudinal waves of pressure, some of which can be perceived as sound. If the molecules are ionized, they will also produce electromagnetic radiation.
vibration
Wind instruments use air to create vibration which creates sound. Percussion instruments create sound through striking a Stretched membrane which produces sound or by the vibration of the instrument as a whole.
Vibration
Sound is produced by vibration in the air. For example, when you speak your vocal cords vibrate, causing a sound. Your ears sense the vibration and tell your brain about the change in environment.
To produce sound, you need a source of vibration, a medium through which the vibration can travel (such as air, water, or a solid material), and a receiver (such as ears) to detect the vibrations and interpret them as sound. Sound is produced when an object vibrates and causes the particles in the medium to also vibrate, creating sound waves that can be heard.
vibration
BY VIBRATION OF THEIR STRINGS WHEN PLACKED
By the vibration of the strings
When a xylophone is struck, it causes the bars to vibrate back and forth. This vibration sets the air molecules around the bars into motion, creating sound waves that travel through the air. The shape and size of the bars determine the pitch of the sound produced.
All sound (including your voice) is a vibration of air.