National Science Week

 

This week is National Primary Science week and all the students at Muritai School are working on physical science investigations!
Room 8 enjoyed making lava in a cup.
Will it still work if you use sugar instead of salt? 
Try it at home!

How does it work?

It looks a bit like a lava lamp because the oil floats on top of the water because it is lighter than the water. Since the salt is heavier than oil, it sinks down into the water and takes some oil with it, but then the salt dissolves and the oil floats back up to the top!!!