| 21. | The gravitational force acting on the hydrometer is simply its weight, " mg ".
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| 22. | In the figure shown here, the hydrometer is floating vertically in a cylinder containing a liquid.
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| 23. | If the level of electrolyte is below the hydrometer, then the battery is past its useful life.
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| 24. | The hydrometer scale equates the specific gravity of the electrolyte with the state of charge of the battery.
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| 25. | The latter included a thermometer, barometer, hydrometer, altimeter and a set of gas analysis instruments.
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| 26. | In this regard, Pappas of Alexandria was recorded as using the hydrometer before Hypatia was even born.
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| 27. | Synesius sent Hypatia a letter describing a hydrometer, and requesting her to have one constructed for him.
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| 28. | To use the hydrometer, one first accurately determines its weight ( W ) while it is dry.
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| 29. | Synesius also sent Hypatia a letter describing a hydrometer, and requesting her to have one constructed for him.
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| 30. | A more reliable method of testing is to use scientific testing equipment, such as an alcoholmeter or hydrometer.
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