Wikijunior:Big Book of Fun Science Experiments/Rainbow columns

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[edit] INGREDIENTS

  • water
  • salt
  • food colouring

[edit] WHAT TO DO

  • Take 2 large spoonfuls of salt and dissolve them in 100mls of water.

Largespoonful.png Largespoonful.png

  • Add a few drops of green food colouring.Beakergreen.png
  • Then you take a large spoonful of salt and dissolve it in 100mls of water.

Largespoonful.png

  • Then add a few drops of yellow food colouring(if you don't have yellow use any other colour).Beakeryellow.png
  • then add a small spoonfull of salt to 100mls of water and add some blue food colouring

Beakerblue.pngSmallspoonful.png

  • add some red food colouring and then you are done.

Beakerred.png

add a bit of food colouring to a test tube.

then add another colour of food coloring very very gently.

Rainbowtesttube.png

add different types of food colouring 2 more times very gently. if it mixes together start again and keep on trying till you get a rainbow .

[edit] Principle

The principle of this experiment is density. Density is the ratio between volume and mass. When different substances of different densities are added to a container, one frequently floats on top of the other because it has lower density. The perfect example of this is oil on top of gasoline.

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