Sound needs a material medium like solid ,liquid or gas to travel and be heard because the molecules of solid, liquid and gases carry sound waves from one place to another. Sound cannot travel through vacuum or empty space because vacuum has no molecules which can vibrate and carry sound waves. Sound is a sequence of waves of pressure which propagates through compressible media such as air or water. Sound can propagate through solids as well, but there are additional modes of propagation. During their propagation, waves can be reflected, refracted, or attenuated by the medium. Electromagnetic and gravity waves do not require a medium to propagate, meaning they can propagate in vacuum as well as compressible media such as air and water. Thus, a “medium of propagation” is any substance that supports the act or process of causing to multiply or spread something out into new regions.
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