I want to do an experiment on: Which material is the most absorbent? There is lots of recommendations to do this experiment but not much guidance on how to do it. What should the children measure? Should there be a certain amount of water, and then they put the material onto it and then squeeze the water out and measure that to check how much water that material can absorb? Or should the children put a certain amount of water onto a material and watch how much it spreads. Have you got any tips?