Fireworks in a Jar

Aim

Materials
• Clear Jar (glass or plastic)
• Oil
• Water
• Several drops of food coloring
• Plastic Fork


Method

1. Fill your jar ¾ full with warm water.
2. In a separate bowl, mix a few tablespoons of oil and several drops of different colours of food colouring.
3. Use your fork to gently mix the oil and food colouring together.
4. Gently pour the oil mixture into the jar.
5. Watch what happens—the food colouring will slowly sink out of the oil and into the water.
When this happens, it will expand and begin to mix with the other colours.

Conclusion

Food colouring dissolves in water but not in oil. The oil is less dense than the water, it will float at the top. The coloured droplets will begin to sink because of their density.

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