Originally Posted by

**Van Rijn**
By the way, this reminds me of a bit I read some time ago on "outside the box" thinking. There is a test question that says:

*You are given a barometer. How do you determine the height of a certain building? *

The expected answer would be to measure the air pressure on the ground and at the top of the building and calculate from there, but there are some other answers:

Use the barometer as a weight on the end of a strong, non-stretching line. From the roof, lower the barometer to the ground. Mark the length of the line, and measure it.

Drop the barometer from the roof. Determine the time it takes to hit the ground. Given the time and acceleration, calculate the height of the building.

Find a building official and say "I'll give you this nice barometer if you tell me how tall the building is."

Use the barometer as a weight on the end of a strong, non-stretching line.

Set it swinging, time the oscillations, calculate length from that.

Put a container of water at the bottom, measure it's temperature, drop the barometer into the container, measure the new temperature, calculate the increase in energy, calculate the height based on lost potential energy of the barometer.

Measure the length of the buildings shadow, measure the length of the barometer's shadow at the same time, use proportions to calculate the height, in barometers.

Using the barometer as a pendulum, measure the difference in frequency of the oscillations, calculate difference in gravity, and thus difference in height.

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Reductionist and proud of it.

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