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Modification of Dead space method by find a new values of dead space factor, iscalled geometrical quenching, depending on a largest dimension of Benson's flames. Anexperimental procedure are cried of Premixed Methan, Butan, and Propan have cared thewith air mixture at 25Co , 75Co , 100Co , and 125Co of unburned gases temperaturescondition have been detected practically for wide range of equivalence ratio by usingschlieren's photography method for tube burner.The effect temperature and equivalence ratio on new factor are studies. Verticaldead space has been detected, and effect of this dimension has been study. The burningvelocity recalculation by new technique and compares with calculation by CCM, andfind the percentage error is less than 10%.