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A homemade lava lamp is a wonderful project to entertain kids of all ages and a great science experiment for in the classroom.

This experiment is a great way to teach kids/students about liquid densities and the fascinating interaction they have with each other. The main safety concern is swallowing any of the materials, such as the oil or Alka-Seltzer. Please have an adult present with the experiment.

Step 1: Gather Materials Needed

Materials

  • Clear bottle or container
  • Vegetable Oil (or any other oil you prefer)
  • Water
  • Food Coloring (any color)
  • Alka-Seltzer Tablets (any brand)
  • Funnel

Step 2: Add Water

Fill the clear container a quarter of the way up with water.

Step 3: Add Oil

Use the funnel to help fill the clear container the rest of the way with the vegetable oil (or any other oil of your choice). Be sure not to fill it completely to the top, leave about 2 inches at the top.

Wait a few minutes for the vegetable oil and water to settle and completely separate. They will stay separated because they are different liquid densities.

Step 4: Add Food Coloring

Add a couple drops of food coloring of your choosing to the clear container. The food coloring will sink and combine with the water. Don’t worry if the food coloring and water don’t mix right away. The next step will fix it if they don’t mix.

Step 5: Add Alka-Seltzer Tablet

Break up the Alka-Seltzer tablet if need be able to fit within a bottleneck. The Alka-Seltzer tablet will sink and only react with the water at the bottom.

Keep an eye on the container, as the Alka-Seltzer may cause it to overflow. Leave the lid off, the pressure that builds up will need to escape somehow.

Now sit back and enjoy your homemade lava lamp. Once the lava lamp has stopped reacting, you can add more Alka-Seltzer tablets anytime you wish.

<p>Interesting idea. A lava lamp effect with out the need for a heat source. Clever.</p>

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