Sound does not travel through a vacuum because molecules of matter are required for sound to exist, and vacuums do not have any matter. The vibrations and movements of small particles of matter are what create sound and allow it to be heard. In a vacuum without any matter, such as space, it is impossible for sound to travel.Continue Reading
According to How Stuff Works, sound is a longitudinal wave. It is created when a movement causes vibrations in its surrounding molecules, usually a gas or liquid. The vibrations spread outwards from the molecules, gradually getting weaker but pulsing outward. Without the matter of the surrounding areas, sound would pass. When these traveling vibrations reach someone's eardrum, they are transferred on to small hairs. These hairs are able to interpret the vibrations and convert them into messages which are relayed through nerves to the brain.
However, in a vacuum, one of the first and most vital steps of this process is missing. Vacuums do not have the prerequisite molecules of matter for vibrations to occur. No waves are transmitted through the movement of molecules. Without these vibrations passing through any gas or liquid, they cannot ever interact with the inner ear. This property makes it so that it is impossible for sound to pass through a vacuum.Learn more about Optics & Waves
Sound occurs when a vibrating source causes rapid variations in the average density of air molecules above and below current atmospheric pressure; sound is perceived when these pressure fluctuations make eardrums vibrate. The changes in atmospheric pressure are called sound pressure, and the fluctuations in pressure are sound waves. Hair cells in the cochlea (inner ear) convert vibrations into electrical signals that then go to the brain.Full Answer >
Because sound energy is created by mechanical waves vibrating through matter, the steady oscillations of sound gradually convert to internal energy of the molecules they vibrate, such as air molecules. A sound stops being audible because its energy has been absorbed by the medium through which it travels.Full Answer >
Sound occurs as a result of the back-and-forth vibration of sound waves travelling across a medium. A sound wave is sometimes referred to as a pressure wave because it contains repeating patterns of high-pressure and low-pressure regions.Full Answer >
Sound or noise pollution refers to the excessive noise that interferes with normal activities, potentially leading to a lower quality of life. The main sources of noise pollution include machines and mechanical equipment, fireworks, vehicles, music performances and emergency sirens.Full Answer >