How Do Aneroid Barometers Work?

A barometer can be used to forecast the weather.
••• barometer image by Edsweb from Fotolia.com

An aneroid barometer is an instrument that helps predict the weather. It can also be used to detect changes in altitude. To do this, it uses changes in air pressure. When air pressure is low, bad weather is more likely.

Features

Inside an aneroid barometer is a small capsule. This capsule has had the air pumped out of it. When the air pressure rises, the sides of the capsule are compressed. The capsule is attached to levers which move a needle as the air pressure squeezes the capsule. A dial behind the needle tells you the air pressure and altitude or weather forecast.

Benefits

Another common variety of barometer is a mercury barometer. The aneroid barometer is superior in some ways to this. Mercury is poisonous, so a mercury barometer requires special handling. An aneroid barometer has the added advantages of being smaller and lighter and easier to move safely. This means that one can be carried in a car or on a ship.

Considerations

An aneroid barometer is not as accurate as a mercury barometer. It is good for situations where a general idea of the altitude or impending weather is needed, but where a mercury barometer would be unsafe. For professional weather forecasting, however, a mercury barometer is better.

Related Articles

How to Convert mm Hg to in Hg
How to Calculate Cabin Differential Pressure
What Units Do Barometers Measure In?
A Major Difference Between Cyclones & Anticyclones...
What Does the Barometer Do?
What Are the 2 Types of Barometers?
Difference Between Hydraulic Fluid & Oil
Instruments Used for Measuring Air Pressure
The Uses of Mercury in Glass Thermometers
How to Calculate Wind Load on a Large Flat Surface
How to Make a Barometer with Mineral Oil
How to Understand Barometric Pressure Readings
How to Reset a TI89
How to Convert Kilopascals to Joules
How to Use Log on a TI-83
How to Predict Weather by the Barometer
Weather Barometer Facts
What Is Sodium Lauryl Sulfate?
Difference Between Barometer, Manometer & Anemometer

Dont Go!

We Have More Great Sciencing Articles!