If the column of mercury in a barometer drops to a lower reading,this means the measured pressure has decreased.

Name: If the column of mercury in a barometer drops to a lower reading,this means the measured pressure has decreased.
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A barometer measures the atmospheric pressure, and the column of mercury in a barometer is directly proportional to the atmospheric pressure. Therefore, if the column of mercury drops to a lower reading, it indicates that the pressure has decreased.

If the Column of Mercury in a Barometer Drops to a Lower