A mercury barometer measures barometric pressure to predict weather changes. It consists of a tube filled with mercury and a reservoir. The height of the mercury in the tube changes with atmospheric pressure, and markings on the tube quantify pressure changes. The unit of choice is millimeters of mercury or mm Hg, with one atmosphere […]
The Fortin barometer measures barometric pressure using mercury in a glass tube. It should be calibrated and kept in a stable environment. The mercury can be toxic, and the barometer may need restoration if it is an antique. Barometric pressure, a measure of the force of the air, is often used in weather forecasting. It […]
A barometer measures atmospheric pressure, which changes with weather and altitude. An aneroid barometer uses a flexible metal diaphragm to indicate pressure on a calibrated scale. It was invented in 1840, is portable, and can be used as an altimeter or barograph. However, it is less accurate than a mercury barometer and must be recalibrated […]
