Solid or Liquid??
Kian spoke with his educator about warming up in the sun, as he was cold one morning. The educator asked Kian what might happen if we placed an ice-cube in the sun Kian thought about it and told the educator that it would surely melt. Kian’s teacher then asked him “How could we would turn it back in to a solid again?”
Kian was unsure of how we could turn it back in to a solid. His educator helped him by asking “How is ice made?!”
To further develop these scientific concepts Kian’s educators provided him with an experience. By using corn flour, water and a little cocoa we created some “mud” for our dinosaur area.
What you need-
Cornflour, water, a wooden spoon, a bowl.
What you do-
Step 1 – Pour half a box of cornflour into a bowl. Then gradually pour water over and mix until it looks and feels like custard.
Step 2 – Run your fingers through the liquid.
Step 3 – Now try and punch the mixture with your fist.
When you run your fingers through it, it acts like a liquid. But when you punch it, it becomes hard and behaves like a solid. (If it doesn’t, try adding some more cornflour.)
How and why?
The cornflour particles are suspended in the water, so it flows like a liquid. But when you apply a force to it, the particles lock together, acting like a solid. As soon as the force is interrupted, the goop goes back to being runny.
When Kian placed the dinosaurs in to the ‘mud’ he discovered that the feet of the dinosaur begun to sink. It was tricky to work out whether it was a solid or a liquid as when it was a tray it was hard but when he lifted it up it turned in to a liquid like it was melting.
Kian began to think about what was happening and many of the children grew quite interested too… was it a solid or a liquid? …Or both?!
When our educators encourage the children to ask questions and provide them with the materials to seek their own answer – long-term learning occurs.