Sound travels fastest in steel, followed by water, then air, and slowest in a vacuum.
Sound is a wave that travels through a medium, such as air, water, or steel. The speed of sound depends on the density and elasticity of the medium. Density is the mass per unit volume of a substance, and elasticity is the ability of a substance to return to its original shape after being deformed.
Steel is a very dense material with a high elasticity. This means that sound waves can travel through steel very quickly. Water is also a dense material, but it is not as elastic as steel. This means that sound waves
travel through water more slowly than they do through steel. Air is a very low-density material with very little elasticity. This means that sound waves travel through air very slowly.A vacuum is a space that is completely empty of matter. There is no air or any other substance in a vacuum. This means that there is nothing for sound waves to travel through. As a result, sound cannot travel through a vacuum.