Q. What is the use of barometer?
A) To measure air pressure
B) To measure the height of aeroplane
C) To measure the depth of ocean
D) To determine the relative density
โ Correct Answer: To measure air pressure
Exam Insight
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.