Associated Studies: Supporting Science: Fuel systems

Bernoulli's principle	Bernoulli's principle states that in fluid flow, an increase in velocity occurs simultaneously with decrease in pressure.
Carbon monoxide	Carbon monoxide is produced during combustion when there are not enough oxygen molecules around the hydrocarbon molecules. This can be caused by an incorrect air-fuel ratio. Carbon monoxide is an extremely poisonous gas.
Venturi	A venturi is the name for a narrower more restricted area in a fluid passage. As fluid passes through a venturi, the fluid pressure drops and its speed increases.
Volumetric efficiency	Volumetric efficiency is a measure of the air-fuel mixture burned in the cylinder, usually expressed as a percentage.
Thermal expansion	Thermal expansion refers to the way some materials expand when they are heated.
Frequency	Sound travels through the air by producing pressure waves - areas of high pressure and areas of low pressure. The rate at which these waves reach our ears is called frequency.
Back-pressure	Back-pressure in an exhaust system refers to a build-up of pressure in the system that interferes with the outward flow of exhaust gases.
Stoichiometric ratio	Stoichiometric ratio is the air-fuel ratio necessary for complete combustion.
Pressure & vacuum	As air pressure is reduced, a vehicle has to reduce the amount of fuel delivered to the engine to maintain the correct air-fuel ratio.
Air density	The density of air is its mass per unit volume.
Tachometric relay	The tachometer indicates engine RPM.
Potentiometer	A potentiometer is a mechanically variable resistor.
Closed loop	A closed loop is part of a feedback system that collects information on how a system is operating & feeds that information back to affect how the system is working.

Topic	Summary