Laboratory / Mathematics
Quantities, ratios, and scale
Choose a familiar object and estimate it in centimeters, meters, and kilometers. Convert each estimate back to meters. The magnitude changes with the unit while the represented length stays fixed.
What changed
A model length near 18 multiplied by scale 9 produces the real-world magnitude.
Return to the route
Experiment after prediction.
Before changing a control, say which visible feature should move and which should remain invariant. That prediction is the useful part of the experiment; motion alone is not evidence.