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Colour-Layered Straw |
This quick and easy science "trick" is fun and interesting and uses materials you may already have around your home. |
Suggested Materials: |
* 1 x drinking straw (clear-coloured, if possible) |
Suggested Instructions: |
Step 1: At home, place your straw about 3 centimetres into your red water in an upright position. |
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Step 2: Place your index finger firmly over the top of the straw and lift the straw out of the red water. You will see red water trapped inside the straw. |
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Step 3: Without removing your index finger, move your straw to your blue water and place your straw about 6 centimetres into the blue water in an upright position. |
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Step 4: Very briefly lift your index finger off the top of the straw and immediately put it back down again. |
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Step 5: Lift your straw out of the water and you will see a band of red water and a band of blue water trapped inside your straw. Show your audience your colourful straw (without removing your index finger). |
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Step 6: Move your straw over the top of the empty plastic cup and take your finger off the top of the straw. Watch the coloured water come rushing out. |
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Step 7: You may like to practice this trick a few times at home before trying it at school. |
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Step 8: At school, repeat Step 1 to Step 6. |
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Note: You can try for a third layer of colour by stirring 2 tablespoons of salt into a third cup of water with food colouring added eg. green. Simply repeat Step 3 to Step 5. During Step 3, place your straw about 9 cm into the coloured water. This third layer can be more difficult to make a success. But it's worth a try! |
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