absolute efficiency: The ratio of the power output of an electroacoustic transducer, under specified conditions, to the power output of an ideal electroacoustic transducer.
absolute expansion: The true expansion of a liquid with temperature, as calculated when the expansion of the container in which the volume of the liquid is measured is taken into account, in contrast with apparent expansion.
absolute instrument: An instrument which measures a quantity (such as pressure or temperature) in absolute units by means of simple physical measurements on the instrument.
absolute magnetometer: An instrument used to measure the intensity of a magnetic field without reference to other magnetic instruments.
absolute pressure gage: A device that measures the pressure exerted by a fluid relative to a perfect vacuum, used to measure pressures very close to a perfect vacuum.
absolute pressure transducer: A device that responds to absolute pressure as the input and provides a measurable output of a nature different than but proportional to absolute pressure.
absolute scale: NULL
absolute specific gravity: The ratio of the weight of a given volume of a substance in a vacuum at a given temperature to the weight of an equal volume of water in a vacuum at a given temperature.
absolute stop: A railway signal which indicates that the train must make a full stop and not proceed until there is a change in the signal. Also known as stop and stay.
absolute temperature scale: A scale with which temperatures are measured relative to absolute zero. Also known as absolute scale.
absolute volume: The total volume of the particles in a granular material, including both permeable and impermeable voids but excluding spaces between particles.
absolute weighing: Determination of the mass of a sample and expressing its value in units, fractions, and multiples of the mass of the prototype of the international kilogram.
absolute zero: The temperature of -273.16°C, or -459.69°F, or 0 K, thought to be the temperature at which molecular motion vanishes and a body would have no heat energy.
absorber capacity: During natural gas processing, the maximum volume of the gas that can be processed through an absorber without alteration of specified operating conditions.
absorber plate: A part of a flat-plate solar collector that provides a surface for absorbing incident solar radiation.