kurranulla,
it was my understanding that sg was related to density. if you can cut back on density you will cut back the sg which gives a lower weight per volume. which means a litre of fuel will weigh less.
but maybe i am barking up the wrong tree.
Specific Gravity
The Specific Gravity - SG - is a dimensionless unit defined as the ratio of density of the material to the density of water at a specified temperature. Specific Gravity can be expressed as
SG = = ñ / ñH2O (3)
where
SG = specific gravity
ñ = density of fluid or substance (kg/m3)
ñH2O = density of water (kg/m3)
It is common to use the density of water at 4 oC (39oF) as reference - at this point the density of water is at the highest - 1000 kg/m3 or 62.4 lb/ft3.
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