Lava Lamp

Oil and water don't mix.

No matter how you hold the bottle the oil always sits on top of the water.

We added drops of food dye to see what they would do.

They stayed as droplets in the oil until we shook the bottle, then they mixed with the water to make pink water.

When we added a fizzy tablet....hey presto...we got a nice lava lamp.

We loved watching the bubbles of Carbon Dioxide rising up through the oil and then sinking down again.