DICTIONARY OF AUTOMOTIVE TERMS - "Ph"

PH:

Measurement of the free hydrogen ion concentration in an aqueous solution. A pH of 7 is neutral.

See pH value

Phaeton:

An open-type body with two cross seats, it usually accommodates five passengers. A folding windshield, folding weatherproof fabric top and removable side curtains are usually standard equipment. The four-seater was called a double phaeton, and the six-seater or seven-seater was called a triple phaeton. Also see sport and Imperial phaeton.

Phase:

1. Distinct functional operation during a cycle.
2. The space relationship of windings and changing values of the recurring cycles of AC

Phase displacement:

The mechanical and electrical angle by which phases in a polyphase motor or main and capacitor (or starting) windings in an induction motor are displaced from one another

Phase-locked loop circuitry:

See PLL circuitry

Phase loss monitor:

Motor protection device for polyphase motors that measures current flow to detect phase loss.

Phase pressure forming:

See solid phase pressure forming

Phenolic:

A wheel cylinder or caliper piston made of platic (phenolic) material rather than metal.

Phenolic spacer:

A carburetor base gasket made from a thermosetting resin used specifically for heat insulation between the carburetor and the intake manifold

Phial:

Term sometimes used to denote the sensing element on a thermostatic expansion valve.

Phillips head screw:

A screw having a fairly deep cross slot instead of the single slot as used in conventional screws.

Phillips screw:

A common type of cross-head screw

Phillips screwdriver:

A screwdriver with a pointed tip that is shaped to fit the crossed slots in the heads of Phillips screws.

Phone:

See:
car phone
cell phone
cellular phone
mobile phone

Phosphate:

See manganese phosphate coating

Phosphate coating:

A special conversion coating produced by phosphating. It is applied to camshafts which promotes oil retention.
Also See:
manganese phosphate coating
zinc phosphate coating

Phosphate section:

A section in a painting line in which phosphate treatment is performed

Phosphate treatment:

A treatment of metals with a phosphating solution to produce a phosphate conversion coating on the surface

Phosphating:

See:
heavy phosphating
low temperature phosphating
phosphate treatment

Phosphating solution:

A solution of phosphoric acid, often enriched with zinc, used during the bodywork production process for cleaning and rust prevention

Phosphor-bronze:

Bearing material composed of tin, lead, and copper.

Photochemical:

Relates to branch of chemistry where radiant energy (sunlight) produces various chemical changes.

Photodiode:

A light-emitting or light-sensitive diode commonly used in sensing or switching circuits.

Photoelectricity:

Physical action wherein an electrical flow is generated by light waves.

Photon:

Particle of electromagnetic energy found in solar radiation.

Photostatically:

Method by which the molecular formation of an element changes due to light.

Photovoltaic cell:

See solar cell

PH value:

A measure of the concentration of hydrogen ions in a solution, which shows the strength of acid or alkaline. The pH value of an aqueous solution is a number describing its acidity or alkalinity. The pH of a neutral solution is 7.0 at 25°C

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