capric lauric pentadecanoic arachidonic and heptadecanoic acids fatty acid molecules can be arranged on a polyol backbone in any number of ways and each polyol can have one two or several different constituent fatty acid molecules the three fatty acid molecules on a triglyceride molecule for example may be the same or may include two or three different fatty acid molecules these fatty acid molecules and their corresponding vegetable oils can also vary in their degree of unsaturation an ester based compound can be a vegetable oil having fatty acids that include at least one degree of unsaturation i e at least one c u2550 c bond this can mitigate the effects of oxidation and help absorb evolved hydrogen gas that can occur under high electrical stress suitable vegetable oils for use in exemplary dielectric fluids of the invention include soya sunflower rapeseed canola corn peanut cottonseed olive safflower jojoba lesquerela crambe meadowfoam and veronia oils as well as high oleic content versions of these oils in particular soya and sunflower oils as well as high oleic acid versions of these oils can be useful a vegetable oil can be used alone or be blended together with one or more other vegetable oils the ester containing.