Any substance burned for heat or power.
Fuel Additives
Chemicals added to fuel in very small quantities to improve and maintain fuel quality and/or to lower emissions.
Fuel Cell
A device that converts the chemical energy obtained from a redox reaction directly into electrical energy.
Fuel Cell Electric Vehicle
An electric vehicle that uses a chemical energy storage that is converted to electrical energy using a fuel cell.
Fuel Cell Poisoning
The lowering of a fuel cell′s efficiency due to impurities in the fuel binding to the catalyst.
Fuel Cell Stack
Individual fuel cells connected in a series. Fuel cells are stacked to increase voltage.
Fuel Consumption
Definitions of fuel consumption calculations.
Fuel Cycle
The processes involved in extracting a fuel in its native form, converting it to a useful product, transporting it to market, and consuming it at its final destination.
Fuel Dilution
The amount of raw, unburned fuel that ends up in the crankcase of an engine.
Fuel Economy Drive Cycle
A drive cycle for a vehicle used to establish emissions and range amongst other performance metrics.
Fuel Injection
Fuel injected into an engine under high pressure so that it atomizes as it leaves the nozzle.
Fuel Injection Pump
The pump used to inject fuel oil into the combustion space of a diesel engine; the fuel pump.
Fuel Injector
Electro-mechanical device that precisely meters fuel into an internal combustion engine.
Fuel Map
A two-dimensional or three-dimensional series of curves storing the information regarding fuel and ignition for the engine, depending on the engine’s requirements.
Fuel Pressure Regulator
Maintains fuel pressure to fuel injector to help insure proper quantity is delivered to engine.
Fuel Processor
Device used to generate hydrogen from fuels such as natural gas, propane, gasoline, methanol, and ethanol for use in fuel cells.
Fuel Pump
A pump used to deliver fuel to the engine.
Fuel Supply Pump
A pump that transfers fuel from the tank and delivers it to the injection pump.
Fuel Surge
The term used to describe fuel surging away from the pick up in the fuel tank thus momentarily starving the engine of fuel.
Fuel Tank
The container for fuel on a vehicle.
The expression of activity for a component in a mixture of gases.
Fujita-Pearson Scale
An empirical scale for estimating the wind speed of a tornado from the damage it causes.
The support on which a lever turns.
Full Annealing
Imprecise term that denotes an annealing cycle designed to produce minimum strength and hardness.
Full Duplex
Operational mode of a communication circuit in which each end can simultaneously transmit and receive data.
Full Flow Filter
A filter that, under specified conditions, filters all influent flow.
Full Hard Temper
In non-heat treatable alloys, it is the hardest temper obtainable by hard cold rolling.
Full Scale Deflection
The maximum value on the scale of an instrument.
Full Wave Voltage Doubler
Consists of two half-wave voltage rectifiers and is used to reduce the output ripple amplitude.
Full Wheel Travel
The wheel is turned as far as possible from full left turn to full right turn, at full jounce and full rebound.
A form of carbon consisting of 60 carbon atoms bound together to make a roughly spherical buckyball.
The process of hammering grooves in hot iron to spread it out thinner.
Fully Ionized Plasma
A plasma in which all the atoms or molecules have been ionized.
Any very rapid reaction which produces heat, light, and noise - explosions.
A specific purpose of an entity; its characteristic action.
Functional Group
A substructure that imparts characteristic chemical behaviours to a molecule, for example, a carboxylic acid group.
In periodic forced vibration, the term fundamental refers to the lowest frequency component present in a harmonic train.
Fundamental Interaction
In the Standard Model the fundamental interactions are the strong, electromagnetic, weak, and gravitational interactions.
Fundamental Particle
A particle with no internal substructure.
Fung Yuan-Cheng
Widely recognized as the father of biomechanics, having established the fundamentals of biomechanical properties in many of the human body′s organs and tissues.
A substance that kill fungi.
A simple organism, e.g moulds, mildews, mushrooms, and toadstools.
A funicular shape is one similar to that taken by a suspended chain or string subjected to a particular loading.
A distance of one-eight of a mile.
Furanose Ring
A five-membered cyclic hemiacetal or hemiketal of a carbohydrate.
A distance of one-eight of a mile.
Furnace Brazing
A process in which bonding is produced by the furnace heat and a nonferrous filler metal having a melting point above 427°C.
A short length of wire that will easily burn out when excessive current flows.
Fused Quartz
The glassy isotropic form of quartz.
Fused Silica


The glassy isotropic form of quartz.

The main body of the aircraft.
Fusible Link
An electrical or mechanical link designed to break under high current or other mechanical input and so break a circuit.
Fusible Plug
A threaded metal cylinder with a hole that is sealed with a metal of low melting point that flows away if a pre-determined, high temperature is reached.
The combining of light nuclei to form a heavier nucleus. Also, the complete mixing of two materials along an edge.
Fusion Zone
All reflections arriving at the observer's ear within 20 to 40 msec of the direct sound are integrated, or fused together, with a resulting apparent increase in level and a pleasant change of character. This is the Haas effect.
Fuzzy Logic
Invented by Lofti Zadeh in 1962.