Explain why sound cannot travel through vacuum ?

Hint:A sound is a mechanical wave that propagates through a medium as a vibration. It can spread through a solid, a liquid, or a gas as its medium. Solids fly the quickest, liquids are slower, and gases are the slowest.

Complete answer:
Unlike light, sound must pass through a medium. This basically means the sound must be able to pass through something in order to be heard. Sound spreads by causing the particles in the medium to vibrate and collide. Your ear drum absorbs the vibrations of the particles when they enter your ear, which the brain interprets as sound.

There are no objects to vibrate in space, so sound cannot move through this medium. You may think that this poses NASA with a communication problem: how do we communicate with astronauts in orbit around the Earth? Radio waves are the response. Radio waves are a form of electromagnetic wave (light), and electromagnetic waves do not need a medium to pass through. Similarly, even if there is a space between the sun and the earth, we can still see light emanating from it.

The fire consumes the oxygen in the bottle when the lighted matches are dropped into it and the bottle is sealed. A partial, but incomplete, vacuum forms inside the bottle without any of the bottle's original oxygen. You won't be able to hear the bell jingle until you let air into the container because of the vacuum.

Note: Sound is a compression wave, which means it travels across a medium by compressing and then lengthening (or vice versa) the distance between two neighboring particles.A sound is a form of energy, just like electricity, heat or light. Let’s examine some sources of sounds like a bell. When you strike a bell, it makes a loud ringing noise.