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I learn in physics that sound travels faster when cold because the molecules are closer together, i think. Just wondingBane
The speed of sound is also affected by other factors such as humidity and air pressure.
it is not a water-proof device... do not expose to water.
Quote from: Steve Joblin on April 20, 2008, 08:11:28 AMit is not a water-proof device... do not expose to water.lola bit obviousalso, I heard you can waterproof it using plastic spray (forgot what its called, something urethane)
amyway, in science, we learnt that submarines use PING sonar and they go underwater so why not water-proof?