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A vibrant, colorful "salt volcano" experiment in a clear glass container. Layers of oil and colored liquid create a volcano-like eruption, with a fluffy cloud of yellow and orange rising from green peaks.

Lava Lamp in a Jar

A mesmerizing science experiment using household items to demonstrate liquid density and chemical reactions. Perfect for kids and educational fun!
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Prep Time 5 minutes
Total Time 5 minutes
Servings 1 jar

Ingredients
  

  • 1 cup water Use room temperature for best results
  • 1/4 cup vegetable oil Any light oil will work
  • 1–2 tablespoons salt Table, sea, or rock salt
  • 2–3 drops food coloring Optional; enhances the visual effect
  • 1 flashlight Optional; adds drama to the bubbling effect

Instructions
 

  • Pour one cup of water into a clear glass or jar.
  • Slowly add one-quarter cup of vegetable oil. Let it sit for a few seconds until the oil floats on top of the water.
  • Add 2–3 drops of food coloring using a dropper or pipette. Watch as the drops pass through the oil and mix with the water.
  • Sprinkle 1–2 tablespoons of salt into the jar. Observe the salt dragging oil down and forming bubbly lava-like eruptions as it dissolves.
  • Repeat the eruption by adding more salt. Experiment with different types or amounts to change the effect.

Notes

Place the jar on a towel or tray to protect surfaces from spills. Shine a flashlight from the side or below in a dark room for a glowing effect. This experiment is best for ages 4+ with supervision. Try using different salts to explore reaction variations.