Rainbow Density Experiment
Description: Make a colorful density column by using different concentrations of sugar solutions.
What is going on?
The layers are made of different densities of sugar solutions. They are layered from the most dense on the bottom, to the least dense on the top. The colored sugar solutions are miscible, or mixable, and will eventually bleed into each other.
5 glasses or clear plastic cups
1. Line up 5 glasses. Add 1 Tablespoon (15g) of sugar to the first glass, 2 Tablespoons (30g) of sugar to the second glass, 3 Tablespoons (45g) of sugar to the third glass, and 4 Tablespoons (60g) of sugar to the fourth glass. The fifth glass remains empty.
2. Add 3 Tablespoons (45 ml) of water to each of the first four glasses. Stir each solution. If the sugar does not dissolve in any of the 4 glasses, then add one more Tablespoon (15ml) of water to each of the four glasses.
3. Add 2-3 drops of red food coloring to the fist glass, yellow food coloring to the second glass, green food coloring to the third glass and blue food coloring to the fourth glass. Stir each.
4. To make the density column, fill the 5th glass about 1/4th full of the blue sugar solution.
5. Carefully layer some green sugar solution above the blue liquid. Do this by putting a spoon over the glass, just above the blue layer, and pouring the green solution slowly over the back of the spoon. If you do this right you won’t disturb the blue solution much at all. Add the
green solution until the glass is about half full.
6. Now, layer the yellow solution above the green liquid, using the back of the spoon. Fill the glass to ¾ full.
7. Finally, layer the red solution above the yellow liquid, using the spoon. Fill the glass the rest of the way.