Liquid Density

	Project title: Liquid Density
Difficulty level:	Elementary school
Main link:	None

Hypothesis:

Most oils are lighter than water. In the same way changing density of a liquid either by changing it's temperature or dissolving things in it will affect how well solid objects float in it. Boats floats on salty water that fresh water because it is denser.

Materials:

Glass
Surgical Spirits
Olive Oil
Water
Glycerine
Blue Food Colourant
Yellow Food Colourant

The Procedure:

Starting with the heaviest liquid, syrup is poured into bottom of glass. Next heaviest, glycerine. Water is added and then olive oil. Finally the lightest liquid, surgical spirits ending with a striped effect in the glass. I'm trying to investigate why these liquids are not mixing and why is the water not sinking between the glycerine. Also why is the glycerine not mixing with the syrup. Procedure have been tried, ended up with spririts floating on top followed by oil, water, glycerine and syrup.

Results:

We ended up with a stripped effect in the glass:

(a) The surgical spirits with the blue food colourant is on top because it is lighter and evaporating because it consist of alcohol.
(b) Next layer is the oil.
(c) Next is the water with yellow food colourant.
(e) Next is the glycerine.
(f) Finally the syrup sinks to the bottom of the glass.