pressure density integral

proportional-integral-derivative / proportional integral derivative (PID)

integral levelling equipment

integral intake

integral water jacket

integral tank

wheel hub integral flange

continuity equation in integral form

integral equation of continuity

integral microphone

line integral of the velocity field vector

proportional–integral–derivative controller (PID controller / three-term controller)

proportional–integral–derivative controller / PID Controller / three-term controller

density of explosive

gas density

high-density metal

loading density

low-density minefield

pattern density function

traffic density

antitank density

high-density airspace control zone (HIDACZ)

high density shock tube

density of travel

ambient density

density balance

density altitude display (DAD)

atmospheric density

standard density

surface of equal density

density gradient

density meter

density of a surface source