<Li> Tying a piece of string to the barometer, which is as long as the height of the building, and swinging it like a pendulum, and from the swing period, calculate the pendulum length . </Li> <Li> Marking off the number of barometer lengths vertically along the emergency staircase, and multiplying this with the length of the barometer . </Li> <Li> Trading the barometer for the correct information with the building's janitor or superintendent . </Li> <Li> Measuring the pressure difference between ground and roof and calculating the height difference (the expected answer). </Li>

How to measure height of building using barometer