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Air Pressure Experiments for Science Part II - The Aneroid Barometer.
Air Pressure Experiments Part II - The Aneroid Barometer
The upper portion of the tube to the extent of about six feet was of glass. Floating on the top of the liquid, the inventor
had introduced a small figure of a man which with the rising of the column in fair weather presented itself to view ; but
with the approach of foul weather retreated out of sight. Science Project Idea 1: How Does an aviator knows how high he is?If a barometer is carried up a mountain the mercury column drops about 0.1 of an inch for every 90 feet of elevation.
Explain why this is so. Explain how an aviator is able to determine his height above the earth. Why is a mercury
barometer unfitted for use in an airplane ?
Can you suggest a method of making a barometer which will not have the objectional features of the mercury barom-
eter?
Suppose some of the air is removed from a metallic box, having sides that go in or out as the pressure on it changes.
What will happen to the sides when this box is carried up in an airplane ? When it is carried back to the earth again ?
The aneroid barometer is made according to this plan. In its simplest form it is a metal box from which a large part of the air has been removed. The cover will bend slightly with changes of pressure of the atmosphere. By a series of levers the extent of movements of the cover of the box is multiplied and represented by a pointer on a dial. Science Fair Project Idea: Why does air pressure not prevent us from lifting objects? Calculate the weight of air resting on a book six by ten inches. You know, however, that the book can be lifted as though there were no weight on it. The following experiment may help you to understand how this can be. Science Experiment for Air Lifting Completely fill a glass with water and cover the top of it with a piece of cardboard, making certain that the cardboard is everywhere in close contact with the edge of the glass. Invert the glass. What happens ? Why ? Hold the glass in different positions. Result ? Conclusion ?
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