Description: highest rotational speed (revolutions per minute) at which the machine as-built and tested is capable of continuous operation; Name: maximum permissible continuous speed 
Description: highest speed for continuous operation recommended by the manufacturer; Name: maximum allowable continuous speed
Description: determined through a surface, product of the sound pressure, p, and the component of the particle velocity, un, at a point on the surface in the direction normal to the surface, integrated over that surface; Name: sound power