Sound Pressure and Sound Power
A sound source radiates power and this results in a sound
pressure. Sound power is the cause. Sound pressure is the
effect. Consider the following analogy. An electric heater
radiates heat into a room and temperature is the effect.
Temperature is also the physical quantity that makes us
feel hot or cold. The temperature in the room is obviously
dependent on the room itself, the insulation, and whether
other sources of heat are present. But for the same electrical power input, the heater radiates the same power, practically independent of the environment. The relationship between sound power and sound pressure is similar. What we
hear is sound pressure but it is caused by the sound power
emitted from the source.
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