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Lava in a Cup

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Lava in a Cup
Lava in a Cup
Student research project plan Ashlee J

Aim: To demonstrate the effects of salt on oil by creating a ‘lava lamp’ in a cup.
Hypothesis: if you add more salt to the cup it would make the oil work like a lava lamp. Equipment: * Clear glass * ¼ cup vegetable oil * 1 teaspoon salt * Water * Food coloring [any color]
Method:
1 - Fill the glass about ¾ full of water
2 - Add about 5 drops of food coloring
3 - Slowly pour the vegetable oil into the glass, see how the oil floats on top
4 - Sprinkle the salt on top of the oil
5 - Watch blobs of lava move up and down in your glass
6 - Add another teaspoon of salt to keep the affect going
Variables:
* Independent - if you pour salt into a cup, lava will start forming. * Dependent - once the salt got poured in the cup blobs started forming. * Controlled - the amount of salt that was poured in the water/oil.
Result: ADD PHOTOS!!!! Oil | The oil floats on top of the water because it is lighter than the water | Salt | Since the salt is heavier than oil, it sinks down into the water and takes some oil with it, but then the salt dissolves and back up goes the oil. |

Conclusion:
What happened was when you poured the salt into the oil; it presses the oil down and forms blobs so eventually making it look like lava in a cup.
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