page_title: Surface wave
hierarchical_section_title: Surface wave
caption_attribution_description: English: Collision of two water drops.
context_page_description: In physics, a surface wave can refer to a mechanical wave that propagates along the interface between differing media, usually two fluids with different densities. A surface wave can also be an electromagnetic wave guided by a refractive index gradient. For radio waves, a ground wave is a surface wave that propagates close to the surface of the Earth.
context_section_description: In physics, a surface wave can refer to a mechanical wave that propagates along the interface between differing media, usually two fluids with different densities. A surface wave can also be an electromagnetic wave guided by a refractive index gradient. For radio waves, a ground wave is a surface wave that propagates close to the surface of the Earth.
caption: Water drop making waves
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