bowl. When used with a liquid-level gauge, it is the
FLUID POWER SYSTEM--A system that transmits
apparatus (metal or cork) that is suspended by the
and controls power through use of a pressurized
liquid and actuates the gauge needle via
fluid within an enclosed circuit.
mechanical linkage or other devices.
FLUID, SILICONE--A fluid composed of silicones.
FLOAT BOWL--A section in the carburetor used as a
It may contain additives.
reservoir for gasoline and in which the float is
FLUID STABILITY--Resistance of a fluid to per-
placed.
manent change in properties.
FLOAT CIRCUIT--In a carburetor, the circuit that
FLUID, WATER-GLYCOL--A fluid whose major
controls entry of fuel and fuel level in the float
constituents are water and one or more glycols or
bowl.
polyglycols.
FLOAT LEVEL--The height of fuel in the carburetor
FLUX--Lines of magnetic force moving through a
as set by the float.
magnetic field.
FLOW, LAMINAR--A flow situation in which fluid
FLYWHEEL-- The rotating metal wheel attached to
moves in parallel layers (also referred to as
the crankshaft of an engine to level out the power
streamline flow).
surges from the power strokes. It also serves as part
FLOW, METERED--Flow at a controlled rate.
of the clutch for manual transmissions and houses
the ring gear for the engine starter.
FLOW RATE--The volume, mass, or weight of a
fluid passing through any conductor per unit of
FOOT-POUND--The amount of work accomplished
time.
when a force of 1 pound produces a displacement
of 1 foot.
FLOW, TURBULENT--A flow situation in which
the fluid particles move in a random manner.
FORCE--The action of one body on another tending
to change the state of motion of the body acted
FLOWMETER--An instrument used to measure
upon.
quantity or the flow rate of a fluid motion.
FOUR-STROKE-CYCLE ENGINE--An engine
FLUID--A liquid or a gas.
that requires four piston strokes (intake, com-
FLUID COUPLING--A coupling in the power train
pression, power, exhaust) to make the complete
that connects between the engine and other power
cycle of events in the engine cylinder.
train members through a fluid.
FRAME--An assembly of metal structural parts and
FLUID, FIRE-RESISTANT--A fluid difficult to
channel sections that support the engine and body
ignite, which shows little tendency to propagate
and that is supported by the vehicle wheels.
flame.
FREE ELECTRONS--Electrons in the outer orbits of
FLUID FLOW--The stream or movement of a fluid,
an atom that are easily moved out of orbit.
or the rate of its movement.
FREE FLOW--Flow that encounters negligible
FLUID FRICTION--Friction due to the viscosity of
resistance.
fluids.
FREON-12--A refrigerant used in air-conditioning
FLUID, HYDRAULIC--A fluid suitable for use in a
and refrigeration systems. Also called
hydraulic system.
refrigerant-12 or R-12.
FLUID, PETROLEUM--A fluid composed of
FREQUENCY--The number of vibrations, cycles, or
petroleum oil. It may contain additives.
changes in direction in a unit of time.
FLUID, PHOSPHATE ESTER BASE--A fluid that
FRICTION--The resistance to motion between two
contains a phosphate ester as one of the major
bodies in contact with each other.
components.
FRICTION BEARING--A bearing having no
FLUID POWER--Energy transmitted and controlled
moving parts. The shaft that rotates simply rubs
through the use of fluids under pressure.
against or rides on a thin film of oil between the
bearing and shaft.
AI-10
