What is sound pressure/sound power?

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Sound pressure level (Lp)

Is a measure of the sound energy emitted from a source of noise, expresses in decibel or dBA.

Sound power level (Lw)

Is the above but measured in predefined conditions.

The sound power level is independant on:

• The location of the equipment
• The environmental conditions, and 
• The distance from the measurement point  
• The sound power level can be considered as the more precise of the two. The sound power will have a higher value than the sound pressure, don't be mislead by this.