Today we’ve been playing with toothpicks to test the surface tension of coloured water. We’ve found out that dipping a soapy toothpick into the water could break the surface tension and our toothpick stars! Have a look at our pictures!
You might think that you can’t fit many drops of water on the surface of a penny. Pennies are just so small! In the Drops on a Penny experiment, though, we’ve investigated surface tension and cohesion at their finest. How many drops of water can fit? There’s only one way to find out… by adding one drop at a time and counting! – Have a look at the outcome!
Does an orange float or sink in water? We began by filling a large bowl of water and placing an orange in the water. The K5 kids discovered that the orange floats. Then we peeled the orange, removing the rind. Next we placed the unpeeled orange in the water and guess what? It started to sink!
The rind of an orange is full of tiny air pockets making it float on the surface!