Russell Kent wrote:

Paul wrote:

One of the ways is a very careful measurement of the density of the fluid in
question. Get a tall skinny glass beaker, put the fuel in it and float a long
skinny cylinder of known weight. How high that cylinder sticks out of the
fluid is an indication of the density of the fluid.

Two things: a. the cylinder material better be less dense than the fuel (or it
sinks), and b. the cylinder material must be non-porous and non-reactive with
the fuel.

Alternate method:
Get a precise gram scale (aka chemist's scale, also aka jeweler's scale) and a
metering pipette (a glass tube with graduations used in chemistry).  You can
borrow the scale; the pipette will set you back no more than $20 from your local
chemical supply house (or borrow one from the school science department).  You
want one that will hold about 100 ml (3 oz.).  Put a cat food can on the gram
scale and zero it.  Measure a precise quantity of fuel (warning: do not drink
it!) and place in the cat food can.  Weigh it.  Density = volume / mass.  Mass =
weight for our purposes.

Russell Kent

 
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