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Lava Lamp

We could stare at this DYI lava lamp all day! My kids love to observe all the different shapes and explosions that get created in the process. Kids will love this cool science experiment and you only need a few simple ingredients.


  • Easy



  1. Fill the container about half way with oil.

  2. Then add about one quarter of water to the container that has the oil.

  3. Sprinkle a couple of drops of food coloring.

  4. Break the Alka-Seltzer into quarters.

  5. Drop each piece into the liquid.

  6. Observe the magic!

  7. Add more Alka-Seltzer once the bubbles stop to repeat.


  • What are you seeing?

  • Why are the food coloring drops sinking?

  • Which has more density water or oil?

  • What if we change the liquid to juice? or water with sugar?


Water and oil don't mix because water is denser than oil. Food coloring has water that is why it sinks to the bottom. The alka-seltzer forms gas bubbles which causes the food coloring to mix with the water and the bubble rise up and fall back to the bottom again.


  • Adult supervision required for any of these activities. Please supervise and make sure children participating are safe. Read instructions and the safety labels from each used materials.


  • This blog post may contain affiliate links for your convenience. I may receive a commission for purchase made through links in this post.


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