Sound can be transmitted by mechanical vibration of solids such as wood, metal, concrete, etc. Since the air transmission efficiency is very low and it is difficult to drive solid vibration, the main source of solid-borne noise is due to the vibration source contacting the surface of the solid medium, such as underground generators or some home appliances. The loss of solid sound transmission is smaller than that of air, and it can travel a very long distance without significant loss of energy. The longitudinal vibration of wood, concrete, etc. is about 2dB lost by about 304.8 meters. If the transmission medium is steel, the loss will be reduced by a factor of 20.
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