Description: The sound pressure level of a sound in decibels is 20 times the logarithm to the base 10 of the ratio of the measured effective sound pressure of this sound to a reference effective 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: proportion of pump available power input, pa, which is delivered as pump power output, pu, after satisfying the losses resulting from friction due to the relative motion of internal surfaces and internal leakage; Name: hydraulic efficiency