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What causes the air pressure dial to move in an aneroid barometer?
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a Mercury inside the barometer rises and falls moving the dial according to the increase or decrease in pressure.
b Weights activated by air pressure change position according to the weight of the air moving a dial on the instrument.
c A spring inside the instrument, connected to a dial, moves when the air pressure contacts the spring.
d A small flexible metal box expands and contracts which is connected to the instrument's dial.
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What causes the air pressure dial to move in an aneroid barometer?
Group of answer choices
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