Sound travels at
- 340 metres per second ( 760mph) in air.
- 1,500 metres per second ( 3,350mph) in water.
- 5,600 metres per second (12,500mph) in glass
The human body is made up of 70% water; this makes it a very good conductor of sound.
Recent developments in medicine show that sound waves can break up kidney and gallstones in the body. Lithotripter is the machine used for this purpose. For an hour or two, this machine woule be used to bombard the stones with a specific sound frequency.---------------------------------------------------------------------------------------
