MATERIALS:
Paper clips
Water
Bowl
INSTRUCTIONS:
- Fill the bowl with water.
- Unfold one paper clip to use as a tool.
- Rest another clip on the tool.
- Gently lay the clip flat on the water, then remove the tool.
- The paper clip should float.
WHY:
Water holds together at its surface with a kind of rubbery “skin”. This tendency of a liquid to form a skin, called "surface tension", is what keeps the paper clip up.
What do you think about? Write your opinion!
MATERIALS:
3 plastic plates
3 bottles of food colouring
skimmed milk
white glue
water
dishwashing detergent
INSTRUCTIONS:
- Put the milk in a plate (better if it is a little warm).
- Add some drops of food colouring in a triangle or square pattern.
- Put a drop of soap in the middle of the food colouring design and watch the colours move.
- Try it with glue and water.
WHY:
Milk has fat in it and the soap breaks up the fat. The food colouring swirls into places where the fat used to be.Soap also prevents glue from sticking together. Nothing happens with water.
WHAT DO YOU THINK ABOUT? Write your opinion.
