« on: 20/11/2007 03:51:26 »
The speed of sound is greater in colder air. Just as sound travels faster in a solid than through air, it travels faster through the more dense air (colder) than the less dense air (warmer). This has to do with the probability of collisions in relation to density...after all, pressure is the sum of many molecular collisions and sound is a pressure wave. This is why the two cups on the ends of string works; the sound travels better through the solid string than through the air.