fortin barometer: determine by the change in the height of mercury column, larger size and not portable, takes longer time to give reading, higher accuracy up to +- 0.1 mmHg, aneroid barometer: determine by the changes in the volume of partial-vacuum metal box, smaller size and portable, gives a direct reading, lower accuracy up to +- 1mmHg,

KSSM F5 PHY 2.2 atmospheric pressure

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