Description: logarithmical measure of the pressure of a sound wave relative to a reference level; Name: acoustic pressure level
Description: Ten times the logarithm to the base 10 of the ratio of the square of the sound pressure, p, to the square of a reference value, p0, expressed in decibels; Name: Sound pressure level
Description: Construction measures for electrical operating media for preventing ignition of the surrounding explosion-capable atmosphere; Name: Explosion protection Type of 'e' protection of the electric motor