In this video It talked about making a rainbow in a cup. The materials that are required are five cups, food coloring, sugar, spoon and some water. The fist thing you have to do is change the density using the sugar and adding different measurements of water to each cup. This changes the density, because you are adding sugar which has a density of 1.59 which is more dense than water and will cause it to sink, but by stirring it together changes the molecules mix and the density of the water changes. The more sugar you add to the water the more the sugar molecules are in space and the denser the water becomes. You will have to start with the most dense water and continue to add the next dense water carefully, because if you are not careful the sugar will mix evenly in the water and the rainbow will disappear. This happens, because once the water is all the same density they no longer float, but they are the same density so all the colors mix together. Here is the link to the video, enjoy:)
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