<Ul> <Li> T is the temperature in degrees Celsius; </Li> <Li> S is the salinity in parts per thousand; </Li> <Li> z is the depth in meters . </Li> </Ul> <Li> T is the temperature in degrees Celsius; </Li> <Li> S is the salinity in parts per thousand; </Li> <Li> z is the depth in meters . </Li>

Who discovered that sound needed a medium to travel through