Additional Information > Exam point of View

A barometer is an instrument used to measure atmospheric pressure, which is crucial for weather forecasting. It works by detecting the weight of the air pressing down on a column of liquid (usually mercury or water). Barometers are essential for predicting weather changes such as storms or clear skies. A drop in pressure indicates bad weather or a storm, while a rise in pressure often signals clear and calm weather. Barometers are widely used in meteorology and also in aviation and mountaineering to assess altitude and predict weather conditions.