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Barometer Weatherball
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Old fashioned weatherball reliably indicates variations in barometric pressure as quickly and accurately today as it did when first developed, circa 1643. Once the ball is filled with liquid, the air trapped inside the ball is no longer subject to variations in air pressure. When air pressure rises, the liquid is pushed downwards. When air pressure falls, the liquid rises. With 50 mL syringe, some tubing for filling ball and coloring tablets.
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