![]() This should be more tangible and easier to understand. How about the difference in viscosity between water and honey? As a demonstration experiment, you could use a funnel in which you pour an equal amount of either liquid, and then measure the time it takes until it has passed through the funnel. However, since you want to explain this to first-graders, you might wanna start with something more obvious than the difference in viscosity between ethanol and water. The speed of the outer cylinder is a measure for the viscosity. Between them is a layer of the liquid that you wish to determine the viscosity of. The outer one can rotate almost freely (with some slight and constant retardation/breaking applied), while the inner one is driven by a motor, like so. A common experiment would be to have two concentric cylinders.
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