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Mercury in the tube adjusts until the weight of the mercury column balances the atmospheric force exerted on the reservoir. High atmospheric pressure places more force on the reservoir, forcing mercury higher in the column.

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14y ago

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More answers

The barometer expands when air pressure decreases.

-by Camille Riestenberg

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12y ago
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High pressure (usually) indicates good weather.

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9y ago
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It means that the pressure is increasing. High pressure usually brings stable, fine weather.

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13y ago
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Clear weather. A falling barometer indicates a storm is coming.

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9y ago
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clear skies

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9y ago
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increasing

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15y ago
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Q: What does a rising barometer tell you?
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