Why is this important?

• The sound pressure level helps to assess noise exposure in the workplace and to plan protective measures more effectively.
• It is therefore an integral part of safety at work

Wikipedia:

The decimal logarithm of the ratio, squared, between the root-mean-square value of the measured sound pressure and its reference value of 20 µPa, which is commonly used in acoustics. The sound pressure level is a measure of sound power, which is proportional to the square of the sound pressure.

[Wikipedia / Further explanation: de.wikipedia.org/wiki/Sound_pressure_level]

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