is the number of grams of bromine that react with 100
grams of a sample of a petroleum distillate, giving an indication of its
relative degree of reactivity, as determined by test method
ASTM-D-1159; it can be used as an indicator
of the relative amount of olefins and diolefins,
which are double-bonded straight-chain or
cyclic hydrocarbons.
Also see bromine index.