In which of the following mediums sound travels the fastest?

Sound travels fastest through solids like steel because the particles in solids are closely packed together, allowing sound waves to propagate quickly through the medium. In contrast, gases like air have particles that are more spread out, which slows down the transmission of sound waves. So, while sound can't travel through a vacuum, and it travels slower through air and water, it travels fastest through steel due to the density and arrangement of its particles.