Glossary “photon” Definition:
Single quantum of light energy that moves as a unit at the speed of light.
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photochemical smog
Glossary “photochemical smog” Definition:
A noxious, unhealthy gaseous compound in the atmosphere, formed by the interaction of various chemicals such as the pollutants hydrocarbons (HC) and oxides of nitrogen (NOx) in the presence of sunlight.
photochemically reactive solvents
Glossary “photochemically reactive solvents” Definition:
Common strong paint solvents such as aromatics, the branch chain ketones, diacetone alcohols and trichlorethylene. Solvents may contain up to 20 % toluene, 8 % xylene, 20 % methylisobutyl ketone, or 20 % trichlorethylene. Emits pollutants into the atmosphere that do not dissipate.
phosphor bronze
Glossary “phosphor bronze” Definition:
A hard, tough alloy of copper (Cu), lead (Pb), tin (Sn), and phosphorus (P), low in friction and resistant to wear.
phosphoric acid
Glossary “phosphoric acid” Definition:
A colorless and odorless acid (H3PO4) used to remove rust from steel and cast iron.
photocell
Glossary “photocell” Definition:
Solid state device that exhibits photovoltaic or photoconductive effects.
photochemical
Glossary “photochemical” Definition:
Describes the action of light (photo) on air pollutants (chemical) which creates smog.
phosgene gas
Glossary “phosgene gas” Definition:
A highly toxic gas, carbonyl chloride (CCOCI2). Until recently, it was believed that phosgene gas was produced when CFC refrigerants, such as R-12, came into contact with heated metal or an open flame. It is now known that little or none of this gas is produced in this manner.
phosphate coating
Glossary “phosphate coating” Definition:
A chemical bond on a steel surface that provides the best adhesion for undercoats. Produced by a metal conditioner or primer.
phasing
Glossary “phasing” Definition:
The rotational position of the U-joints on the drive shaft.
phenolic piston
Glossary “phenolic piston” Definition:
Piston used in some disc brake calipers, to help stop the heat transfer to the fluid. Piston is made of a phenolic plastic, which help to made is more resistant to corrosion also.
phenolic plastic
Glossary “phenolic plastic” Definition:
Plastic made primarily from phenol, a compound derived from benzene or carbolic acid.
phillips screwdriver
Glossary “phillips screwdriver” Definition:
Hand tool that has two crossing blades for a star-shaped screw head.
PGM-FI
Glossary “PGM-FI” Definition:
Programmed – Fuel Injected. This is Honda’s fuel injection system used on Accord, Civic, and Prelude.
pH level
Glossary “pH level” Definition:
A measure of the acidity or alkalinity of a solution on a scale where pH0 is most acid, pH14 is most alkaline, and pH7 is neutral.
phase
Glossary “phase” Definition:
1). Time displacement expressed as an angular displacement between two or more ac quantities. 2). Referring to the rotational positions of the various elements of a drive line.
phase separation
Glossary “phase separation” Definition:
Happens when the alcohol in the gasoline absorbs water in the tank and sinks to the bottom
PGM
Glossary “PGM” Definition:
Poly Gel Mitigator. A type of energy absorber that is used instead of fluid to absorb energy.
PFS
Glossary “PFS” Definition:
Purge Flow Sensor
PG
Glossary “PG” Definition:
Propylene Glycol, or Pulse Generator