Sound travels at a speed that is dependent on density. As a rule the more dense the material the faster sound travels. In air, mach 1 (the speed of sound) is about 750 MPH. In water it is about 3316 MPH. (Water is much denser than air.)
I believe you mean "why does it matter how fast sound can travel?" There are many reasons for why it matters to know how fast sound travels. it can help with determining the distance of a lightning storm, tuning instruments, and is helpful with ballistics. -Tychusfindlay919
Oxygen
Solids
3400mph
3,348 mph.
900 years
Sound cannot travel through a vacuum as it needs a medium, such as air, water, or solid material, to propagate. In a vacuum, there are no particles for sound waves to travel through, so the speed of sound is essentially zero.
The rate at which sound travels through stone depends on the stone. Sound will travel faster through warm stone than cold stone.
it travels at 250-275mph
All the molecules are packed in tight and in an orderly fashion so the sound can travel faster through it. Gases have molecules away from each other so the sound cannot be passed through the vibrating and bouncing molecules so well.
5000 meters per second
100m/s