how do use a barometer to measure a building's height????

Question

i've got this question from my prof.
he said he borrowed it from a popular book...
but i just cant find it!!
any help out there???

Answer 1

couple of links that will help you..

Answer 2

If i'm thinking right, a barometer measures preasure. So the higher up the building you go, the lower the pressure is. On the surface of the ground, the pressure is the heaviest, so the barometer would be pointing at a high number. But if you went on top of a building, the borameter would point to a lower number. I think that is the right track.

Answer 3

i know all the ways to measure it with barometer and the way it's written in that book. you just tell him n he'll be impressed



1)
use the formula of P=density*g*h

2)
you can tie the barometer with a long rope go at the top of the building. use it as pendulum. meaure the time period of the oscillations. and use the formula of time period(i'm sorry i can't recall that formula, it is something like 2*pi*(sqrt)[l/g]

3)
you can drop the barometer from the top of the building. note down the time it takes to reach the bottom and use this
h = g*t*t/2

4) although funny but this one is a method too (and its there in the book)
throw the barometer back at the person who asked the damn question and ask him the height of the building

Answer 4

I don't think that it would be a terribly accurate method for measuring height, but what one could do is take two barometers, and calibrate them, so that they read identically for a given pressure - then put one at the top of the building and the other at the bottom - then a friend would have to signal the reading at the top while you read the one at the bottom (which can be done by walkie-talkie) - then in knowing the mass of a given column of air of that height, one can calculate the pressure differential, and then from that, calculate the column height of air involved, which would be one and the same as the height you are trying to measure.




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Answer 5

Near the earth's surface, the pressure drops by 100mB (hPA) per 1000 metres. At the top of a 20 story building, say 60m tall, the pressure would read 6mB lower than at ground level. This would be measurable even using a domestic barometer, which probably has a scale of 940 to 1080mB; but it wouldn't be very accurate.

Answer 6

I like this barometer story. I give you a star.

Answer 7

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