We measured the time it took the marble to sink from the top line to the bottom line in the shampoo at three different temperatures.

The time for the marble to sink in shampoo at room temperature was greater than the time to sink in warm shampoo, and less than the time to sink in cold shampoo. From the data, we see that cold shampoo has a higher viscosity than warm shampoo and shampoo at room temperature. We can infer that the viscosity of shampoo increases as the temperature decreases

Try these ideas

Here are some additional variations to try. Repeat the experiment using:

1. a marble of a different size.
2. a different liquid, such as corn syrup.
3. a taller bottle or a different sinking distance.

Or, try Another Viscosity and Temperature Experiment.