Microchem
Microscale Chemistry Experimentation for Teachers
 
 
 
 

1-ml syringes for density measurements of "red alcohol"

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Left: "Red alcohol" (Isbirtu ahmar) - the denatured alcohol used in Egypt - is floating on water.
So its density is smaller than 1.0 g/ml. (In such a closed vial DIFFUSION of alcohol can be observed for days).
Photo 2: Two syringes prepared by removing the needles are filled with air and balanced on the scale.
Photo 3  Callibration of 10 x 10 paper units: 100 units of paper equal 120 mg. So 1 paper unit is 1.2 mg.
Right: 1 ml water in the right syringe is balanced by 1 ml "red alcohol + 166 units of paper.
So 1 ml of "red alcohol" is 1000 - (166 x 1.2) mg = 801 mg = 0.801 g. Its density is 0.801 g/ml.