Sugar and soap move objects Soap can "force" objects to move on the surface of water. Sugar can do the same, but the movement is different. Let's check.
Necessary materials: A bowl of water, matchsticks, a sugar cube, a piece of soap
How the experiment is performed 1. Break the matchsticks into smaller pieces and allow to float on the water. 2. Put the sugar cube into the centre of the bowl. 3. Now put the piece of soap into the centre of the bowl.
What will happen? The sugar will move the pieces of wood towards the centre. The soap will move the pieces away from the centre.
Why? Sugar is porous and draws water into itself, pulling the pieces of wood along in the current it thus creates. As we have seen in the preceding experiment, the soap dissolves and emits oil residues, which weaken the surface tension of the water and propel the pieces away from the centre of the bowl.
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