Description: ten times the logarithm to the base 10 of the ratio of the square of the sound pressure to the square of the reference sound pressure; 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: special measures which are hit on equipment to prevent the ignition of a surrounding atmosphere; Name: Explosion protection-ignition protection type of the complete device