These barometers contain a flexible metal box called an aneroid cell, which expands or collapses in response to barometric pressure. In turn, this causes the hand on the barometer to move ...

These barometers contain a flexible metal box called an aneroid cell, which expands or collapses in response to barometric pressure. In turn, this causes the hand on the barometer to move ...

Aneroid barometer: An instrument that measures air pressure by detecting the movements of a thin, hollow, partially evacuated metal disk that expands and contracts as air pressure changes.

Aneroid: Rather than using liquid, aneroid barometers utilize a flexible metal box known as an aneroid cell. Changes in air pressure cause the cell to slightly expand or contract.

This informative guide breaks down everything you need to know about barometers before buying one for your home or place of business.

Barometers can't match the accuracy of computer-driven weather forecasts but are indispensable for basic predictions and spotting local precipitation trends.