Waves: Mediums

The video explains how sound waves travel faster through solids like train tracks than through air, allowing one to hear an oncoming train sooner. It defines a medium as the substance through which waves travel, with examples like water for ocean and sound waves. Mechanical waves require a medium, unlike electromagnetic waves, which can travel through a vacuum. The video concludes by explaining that sound cannot travel in space due to the lack of a medium, while light, an electromagnetic wave, can.

How do mechanical waves differ from electromagnetic waves?

Why can't sound travel in a vacuum?