How to measure the volume of your bathtub: - Fill with cold water - Heat electrically with known constant power - Measure rate of temperature change
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Physicists will do this: measure the length and width of the tube, calculate the mean, consider it the diameter of a perfect sphere, use the formula for its volume, call the discrepancy "experimental error" and write a paper about it.
I've got a great formula for predicting the results of horse races! Unfortunately it only works for spherical horses in vacuum..
