Waves travel their best in the gaseous state. That is because the molecules in the gas are not closely held together like in solids and liquids. It therefore gives ample space for the waves to travel.
It depends on what kind of wave. Sound waves travel better through liquids and solids. Light waves travel better through in gas. Sound waves also travel faster if they are in a warmer state of matter.
It kinda depends on what kind of wave it is. If it is a sound wave it will travel best through solids like metals.
Sound travels best through solids because they are more dense, giving the waves more room to move through.
Sound travels best through solids and liquids .here is a discussion on this to explain more. Hope this helps. En.allexperts.com/q/Science-Kids-3250/sound-travel-best-solid.htm