Originally Posted by
FlightDetent
While I can attest that operating a contemporary jet is not an exact science, certainly there is hope that the engineering would be. PPM stands for 1 x 10^(-6), no units given - it's a simple multiplier. That does not taste right. Perhaps mg/kg or ml/m^3, anyone?
When adding weight per volume, which is how this additive is used, it's exactly right. For example, if the rate of addition (I'm just making up numbers here} is 100 ppm (100 mg/L) and the volume of fuel is 7000L we would need to add (100 mg/L)(7000 L)/1000 mg/g = 700 g or .7 kg. Pretty simple.