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DIY Lava Lamp (Science Style)
Clear 2L soda bottle
2 fizzy tablets (such as Alka-Seltzer®)
1. Using the funnel, fill the bottle about ¼ full with water.
2. Add 56 drops of food coloring. Swirl the water in the bottle to mix.
3. Next, using the funnel, fill the rest of the bottle with vegetable oil
4. Now, break up the tablets in half so they will fit into the mouth of the bottle.
5. Drop the pieces into the bottle. Immediately stretch the balloon over the top of the bottle to seal it.
6. Watch the awesome colors dance around!
How It Works:
Oil is less dense than water so it floats on top. When the fizzy tablets are added, a chemical reaction happens producing bubbles of carbon dioxide (CO2). CO2 is less dense than both water and oil, and so rises up, dragging blobs of colored water along with it. These blobs of colored water rise to the top and then fall again when the gas reaches the surface. The balloon inflates due to the CO2 collecting at the top of the bottle. The best part is you can do this over and over again by adding more fizzy tablets (its reusable!).