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Wave

Sound Is a Wave (it needs a medium) Transverse vs. Longitudinal Waves medium http://dictionary.reference.com/search?q=medium

• An intervening substance through which something else is transmitted or carried on.

Longitudinal Waves

move in the same direction as the wave between 0° and 180° to the direction of the wave.

A sound wave is a longitudinal wave

Transverse Waves

move at right angles to the direction of the wave.

Water is a transverse wave

Transverse Wave and Longitudinal Waves http://www.phy.ntnu.edu.tw/java/waveType/waveType.html

Neither the molecules in the air or those in water actually move along with the wave. Air and water are simply a medium for the wave to pass through.