Rank intermediate between officer and rating, and in charge of ratings; more or less equivalent to the rank of sergeant.

Port Forward.

Personal Flotation Device

PFD Manufacturers Association

Per Freight Ton

Persian Gulf (See AG)

Permanent Group of Experts (in agreement on subsidies and countervailing measures).

A measure of the acidity or alkalinity of a solution; The negative logarithm of the hydrogen-ion activity; it denotes the degree of acidity or basicity of a solution. At 25

Measure of alkalinity or acidity in water and water containing fluids. Can be used to determine the corrosion inhibiting characteristic in water based fluids. Typically, pH > 8.0 is required to inhibit corrosion of iron and ferrous alloys in water based f ...

Alternating current is carried by conductors and a ground to residential, commercial, or industrial consumers. The waveform of the phase power appears as a single continuous sine wave at the system frequency whose amplitude is the rated voltage of the pow ...

The process of changing from one physical state (solid, liquid, or gas) to another, with a necessary or coincidental input or release of energy.

A material that can be used to store thermal energy as latent heat. Various types of materials have been and are being investigated such as inorganic salts, eutectic compounds, and parrafins, for a variety of applications, including solar energy storage ( ...

A plastic molding component formed by the reaction of phenol and formaldehyde. It can be heavily reinforced or "filled" with glass fibers or other materials. Phenolics are known for their high impact strength, excellent wear characteristics, and dimension ...

Philippines (flag).

Philippines (Flag)

Alphabet used by the Navy when making sure that a letter is understood; i.e. "BRAVO OSCAR ALPHA TANGO spells BOAT"

Forming an adherent phosphate coating on a metal by immersion in a suitable aqueous phosphate solution. Also called phosphatizing. See also conversion coating.

A photometric unit of illuminance or illumination equal to one lumen per square centimeter.

A hydrogen production process that process uses algae. Under certain conditions, the pigments in certain types of algae absorb solar energy. An enzyme in the cell acts as a catalyst to split water molecules. Some of the bacteria produces hydrogen after th ...

An electric current induced by radiant energy.