Density is a fascinating thing that we see around us all the time! This easy experiment illustrates the idea of density in liquids and it will look pretty cool in your next lunch party!

You will need:

  1. Juices that have different density levels. The density of a juice is often determined by how much sugar or fruit is in it – the more sugar or fruit, the more dense the juice is. You will have to do some experimentation to find juices that are colourful and give a nice display of density, and that’s half the fun.
  2. A narrow glass (the more narrow it is, the easier it is to separate the density levels)
  3. Eye dropper or turkey type baster.


What to do:

In order to display your density levels, you will need to find out which of your juices are the most and least dense. Pour one of your juices into the narrow glass to fill it about 2.5 cm high. Fill a dropper with another juice and slowly drop it onto the inside of the glass so that it runs down the side of the glass. Watch the juice to see if it goes below or above the juice in there. (if it simply mixes with the juice and does not go above or below, it has the same density as the juice and you will need to move on to your next juice).

Continue experimenting with other juices to determine which juices go to the bottom (more dense) and which ones go to the top (least dense.)

Once you have the densities determined, start over with a clean glass and use the dropper for each level to create your final Drink of Density!


How Does It Work?:

The density of liquids demonstrates the the amount of “stuff” (atoms, mass) that are present in a particular volume of the juice. In other words, if you have cup with 200ml of plain water, and a cup with 200 ml of water that has lots of sugar dissolved in it, the cup of sugar water will be heavier even though they are the same volume of liquid – the invisible sugar molecules are dispersed in the water, making it heavier (more dense.)


This and other cool experiments can be found at Sciencebob