describe a simple barometer
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A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A simple barometer consists of a long glass tube (closed at one end, open at the other) filled with mercury and turned upside down into a container of mercury.
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A spring balance is a device which is used for measuring the force acting on an object. It has a coiled spring which gets extended or stretched as the force is being applied.
Larger the streching of spring, greater is magnitude of force.
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