Do sound waves travel slowest in gases?

Answer 1

Particle's in a solid are more closely packed, and vibrations, from sound, are easily transmitted as the particle's bump together.

In a gas the particle's are spread out, and hence collide less, and so do not transmit vibrations caused by sound easily.
because the molecules in solids are more tightly packed together then the molecules a gas
Sound doesn't travel at the same speed through all solids, liquids, gases, and even plasmas. But to answer your question in the simplest way, a sound is the movement of molecules through a medium (i.e. a gas, liquid, solid, plasma) caused by vibrations. A solid is a lot more dense than a gas under normal conditions. So you can imagine that because there are more molecules per a given volume of a solid compared to a gas, those molecules in the solid are more closely in contact with each other and when a sound hits or passes "through" a solid, there are more collisions of molecules in a given amount of time through a solid than compared to a gas which allows the sound, or vibrations of molecules, to move quicker through a solid than through a gas. This allows the sound to travel quicker through a solid than a gas. So as long as the density of a material is higher than another material, it will allow sound to travel faster through it. It would be like trying to pass a baton of in relay race to see how fast the baton can be handed off from person to person. The closer the runners are together, the faster the baton will make its way from person to person.

Sound also travels faster through materials which are more rigid. This greater rigidity is due to stronger bonds between the atoms making up the more rigid material. With stronger bonding, smaller displacements result in the same forces between neighbouring atoms. So to transmit a sound wave, the atoms don't need to move as far in a more rigid material and the sound waves can travel more quickly.

Answer 2

Yes. They travel the fastest through solids.