Apologia General Science
Experiment 3.4
What Does Soap Do To Water? Part Two
Our book, notebook, and kit:
Apologia Exploring Creation with General Science, 2 Vol, 2nd Ed.
**I have the first edition of this science book, so my book looks a little different. I met Dr. Wile and asked him if we needed to move to the updated version and he said there wasn't too much difference between the two versions. **
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| The things you will need for this experiment- |
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| The hardest part of this experiment was getting the thread, two lengths of the same length, then taping them to the far side of the bowl of water. |
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| They have to semi-close-together so you can lay a needle down on the two lengths of string and then slowly lower the thread into the water, which is also lowering the needle into the water. The "goal" is to get the needle to stay on top of the water and float on the **surface tension**. |
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| The book had a nice illustration |
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| The needle would fall into the water repeatedly whenever she tried to get the thread off the needle |
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| The needle floats well, while on the thread! |
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| Ta-Dah!!! She got the thread to stay on the surface and got the thread removed!! It took about five tries. |
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| The empty tweezers are the "CONTROL". We put the tweezers in the water and see if that effects the floating needle...it doesn't. Then put tissue paper in the tweezers and see if that effects the floating needle...it doesn't. Then put gum in the tweezers and dip that in the bowl to see if it effects the needle...it doesn't. Then: |
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| About to try putting the soap into the bowl.... |
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| The tension is building.... |
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| As soon as the soap went into the water the needle stopped floating and sank to the bottom of the bowl. |
I had watched various youtube shows on how to do these experiments and I saw this one that looked even easier than doing this trick with the thread. Instead of thread, put the needle on a piece of tissue and lay them both on the top of the water surface.
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| For a few seconds the tissue and the needle all float happily... |
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| The the tissue starts to slowly sink to the bottom of the bowl |
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| The needle is left happily floating on the surface of the water. Then you could do the experiment from here---without having to mess with the thread. Add the tweezers, then add the tissue to the tweezers, then try the gum...lastly try the soap and watch the needle drop. The point, again, is to see how soap can change the SURFACE TENSION. |
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