State two advantages of an aneroid barometer over a simple barometer.
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Advantages of an aneroid barometer over a simple barometer are —
(a) Aneroid barometer is calibrated directly to read the atmospheric pressure.
(b) It has no liquid and is portable.
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Give two reasons for the use of mercury as a barometric liquid.
State two factors which affect the atmospheric pressure as we go up.
How does atmospheric pressure change with altitude ? Draw an approximate graph to show this variation.
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