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Mechanical waves are waves that need medium to propagate so they don`t travel through vacuum but through solid , liquid or gas.
Mechanical waves (like seismic waves) will travel faster through a solid than a liquid.
liquid
liquid
Solid
A liquid
Waves that require a medium through which to travel are called mechanical waves. They require a medium (gas, solid, and liquid).
liquid
Sound (and vibration) are a wave system of sequential compressions and rarefactions of a material. These waves are mechanical and do need a substance through which to travel. They cannot travel through a vacuum.
Sound waves travel through matter, whether solid, liquid, or gas. They do not travel through vacuum.
Any material through which any wave travels is called a medium. Ocean waves travel through the medium of seawater. Sound cannot travel through outer space, because there is no medium there to support sound waves. Mechanical waves such as sound and vibration require a medium through which to travel. Usually air, or a solid or liquid - matter in other words.
They travel faster through solids