Description: percentage availability of a component over a certain period of time; Name: Availability depending on time
Description: During a given period of time, percentage of the time during which an item was able to perform when required ; Name: Time based availability
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