Science club’s lava lamps

Today in science club we made our very own lava lamps!  Here’s how we did it, why don’t you try it at home?!

First of all we needed the following ingredients: water, cooking oil, empty bottles, food colouring and alka seltzer.

 We poured a small  bit of water into the bottle and then filled it with oil.  It was interesting when the oil didn’t mix with the water, it sat on top of it instead.   We put a few drops of food colouring in and it dropped like small bubbles through the oil.  When it hit the water it mixed and turned the water a different colour.

 

 When we put in the alka seltzer it turned our mixture into our lava lamp!!