||Bernoulli's principle states that in fluid flow, an increase in velocity occurs simultaneously with decrease in pressure.
||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.
||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 is a measure of the air-fuel mixture burned in the cylinder, usually expressed as a percentage.
||Thermal expansion refers to the way some materials expand when they are heated.
||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 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 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.
||The density of air is its mass per unit volume.
||The tachometer indicates engine RPM.
||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.|