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 Calculate Cabin Differential Pressure
What Are the 2 Types of Barometers?
How to Reset a TI89
How to Convert mm Hg to in Hg
What Units Do Barometers Measure In?
A Major Difference Between Cyclones & Anticyclones...
What Does the Barometer Do?
Where Is Mercury Found?
How to Convert 48 Millimeters to Inches
The Uses of Mercury in Glass Thermometers
How to Convert Kilopascals to Joules
Difference Between Barometer, Manometer & Anemometer
How to Use Log on a TI-83
How to Calculate Wind Load on a Large Flat Surface
Characteristics of Aquatic Plants
How to Convert Pounds Per Square Foot to PSI
How to Convert mmHg to a kPa
How to Make a Compass
How a Hydraulic Jack Works

Dont Go!

We Have More Great Sciencing Articles!