1. Comparing the absorption rates of different types of paper towels: You can test this by dripping a certain amount of water on different types of paper towels and measuring how much water each paper towel absorbs.
2. Comparing the elasticity of different types of rubber bands: You can test this by stretching different types of rubber bands to different lengths and measuring the force required to stretch them.
3. Comparing the conductivity of different metals: You can test this by building a simple circuit with a battery, a light bulb, and wires made of different metals, and measuring the brightness of the light bulb.
4. Comparing the solubility of different substances in water: You can test this by dissolving different substances in water and measuring how much of each substance dissolves.
5. Comparing the pH of different liquids: You can test this by using a pH meter or pH test strips to measure the acidity or basicity of different liquids.
6. Comparing the boiling points of different liquids: You can test this by heating different liquids and measuring the temperature at which they boil.