Absorption — Bulk Modulus

Absorption - The physical mechanism by which one substance attracts and takes up another substance (liquid, gas, or vapor) into its interior.

Accumulator - A container in which fluid is stored under pressure as a source of fluid power.

Accumulator, hydropneumatic bladder - A hydropneumatic accumulator in which the liquid and gas are separated by an elastic bag or bladder.

Actuator, pneumatic/hydraulic - A device in which power is transferred from one pressurized medium (pneumatic) to another (hydraulic) without intensification.

Additive - A chemical added to a fluid to impart new properties or enhance those that already exist.

Adsorption - The physical mechanism by which one substance attracts another substance (either solid, liquid, gas, or vapor) to its surface and  causes the second substance to adhere to its surface.

Aftercooler - A device which cools a gas after it has been compressed.

Afterfilter - A filter which follows the compressed air dryer and usually for the protection of downstream equipment from desiccant dust.

Air - A gas mixture consisting of nitrogen, oxygen, argon, carbon dioxide, hydrogen, small quantities of neon, helium and other gases.

Air bleeder - A device for removal of air.

Air breather - A device permitting air movement between atmosphere and the component in which it is installed.

Air motor - A device which converts pneumatic fluid power into mechanical torque and motion. It usually provides rotary mechanical motion.

Air, compressed (pressurized) - Air at any pressure greater than atmospheric pressure.

Air, dried - Air with moisture content lower than the maximum allowable for a given application.

Air, free - Air at ambient temperature, pressure, relative humidity, and density.

Air, saturated - Air at 100% relative humidity, with a dew point equal to temperature.

Air, standard - Air at a temperature of 68.8° F, a pressure of 14.70 pounds per square inch absolute, and a relative humidity of 36% (0.0750 pounds per cubic foot). In gas industries the temperature of "standard air" is usually given as 60.8° F.

Amplification, power - The ratio between the output signal variations and the corresponding input (control) power variation (for analog devices only).

Amplification, pressure - Ratio between outlet pressure and inlet (control) pressure.

Amplification - The ratio between the output signal variations and the control signal variations (for analog devices only).

Analog - Of or pertaining to the general class of fluidic devices or circuits whose output varies as a continuous function of its input.

AND device - A control device which has its output in the logical 1 state if and only if all the control signals assume the logical 1 state.

Aniline point - The lowest temperature at which a liquid is completely miscible with an equal volume of freshly distilled aniline (ASTM Designation D611-07).

Aniline point - The lowest temperature at which equals volumes of pure, fresh aniline and an oil will completely dissolve in one another is the aniline point of the oil.

Bernoulli's Law - If no work is done on or by a flowing frictionless liquid, its energy due to pressure and velocity remains constant at all points along the streamline.

Bleeding - Migration to the surface of plasticizers, waxes, or similar materials to form a film or beads.

Boyle's Law - The absolute pressure of a fixed mass of gas varies inversely as the volume, provided the temperature remains constant.

Breakout Force - That force necessary to initiate sliding by overcoming static coefficient of friction. An excessive breakout force indicates the development of adhesion.

Breathing capacity - A measure of flow rate through an air breather.

Bulk modulus - The measure of a fluid's resistance to compressibility. It is the reciprocal of compressibility.