The lowest compression ratio which allows compression ignition of a specific fuel. 
The lowest compression ratio which allows compression ignition of a specific fuel. 
Related Terms 
COMPRESSION RATIOThe ratio of the absolute pressure at the discharge from a compressor divided by the absolute pressure at the suction. For internal combustion engines compression ration is absolute pressure at the end of compression stroke divided by absolute pressure at beginning of this stroke 
COMPRESSION IGNITIONIgnition produced by compression of the air in a cylinder of an internal combustion engine before fuel is admitted. 
DIESELING

BULK MODULUS OF ELASTICITYThe ratio of the compressive or tensile force applied to a substance per unit surface area to the change in volume of the substance per unit volume. Also known as bulk modulus; compression modulus; hydrostatic modulus; modulus of compression; modulus of volume elasticity. 
PRESSURE RATIOThe ratio of the absolute discharge pressure to the absolute inlet pressure in any compression cycle. 
PLATE GIRDERA riveted or welded steel girder having a deep vertical web plate with a pair of angles along each edge to act as compression and tension flanges. 
FIN EFFICIENCYIn extendedsurface heatexchange equations, the ratio of the mean temperature difference from surfacetofluid divided by the temperature difference from fintofluid at the base or root of the fin. 
DUTY CYCLEAn expression of the fraction of the total time of pulse radar that radiofrequency energy is radiated. It is the ratio of pulse length to pulse repetition time. 
COEFFICIENT OF STRAINFor a substance undergoing a onedimensional strain, the ratio of the distance along the strain axis between two points in the body, to the distance between the same points when the body is undeformed. 
AFTERCOOLERA heat exchanger that removes the heat of compression from the air (or other gas) after it leaves the last stage of a compressor. 
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