The type of wave that travels slower through gases than it does solids is a sound wave.

Here's why:

* Sound waves are mechanical waves: This means they require a medium (like air, water, or solids) to travel.

* Speed of sound depends on the medium's properties: Specifically, the speed of sound is related to the density and elasticity of the medium.

* Gases are less dense and less elastic than solids: This means the particles in a gas are further apart and interact less strongly than particles in a solid.

* Less interaction = slower wave travel: The slower interactions between particles in a gas result in a slower transmission of sound energy, hence a slower speed of sound.

Let me know if you have any other questions!