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Old 09-02-2022, 11:22 AM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 8,032

Originally Posted by theduff View Post
If you can mix it with 100LL wouldn’t that mean the density is the same ? If you look at the picture at the on AVWeb ( link post 39 ) with both fuels mixed there is no stratification. With 100LL Blue and G100 UL yellow you get a beautiful green !
Am I being over simplistic to think that means the densities are equal unlike the oil and water mix we’ve all seen.
Yes, you are over simplifying.

Not a chemist, but I don't believe that density has anything to do with solubility, though the densities will dictate the stacking of layers of stratification in insoluble mixtures, like oil and water. Thought is was about molecular bonding; Think back to HS science - some molecules happily combine with others and some don't. Something about free neutrons at the atomic level, I think. Mix oil and gasoline and they combine perfectly eventhough they are very different densities, but very similar at the molecular level. Gasoline starts as oil and requires heat and evapoation to refine it out. It doesn't naturally create different layers. Oil is around 7.5 lbs/gall and gas is around 6 lbs/gallon. Salt water doesn't perfectly mix with fresh water due to being the same density; We know they are different densities, as we humans float on salt water and sink in fresh water. Salt and water are also different densities, but mix perfectly and don't separate, otherwise the oceans would be freshwater with a layer of salt at the bottom.

N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019

Last edited by lr172 : 09-02-2022 at 11:51 AM.
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