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  2. Hydrometer - Wikipedia

    en.wikipedia.org/wiki/Hydrometer

    The state of charge of a lead-acid battery can be estimated from the density of the sulfuric acid solution used as electrolyte. A hydrometer calibrated to read specific gravity relative to water at 60 °F (16 °C) is a standard tool for servicing automobile batteries. Tables are used to correct the reading to the standard temperature.

  3. Twaddell scale - Wikipedia

    en.wikipedia.org/wiki/Twaddell_scale

    On this scale, a specific gravity of 1.000 is reported as 0, and 2.000 reports as 200. [1] Concentrated sulfuric acid with a specific gravity of 1.8 has a Twaddell scale measurement of 160 (as per the linear relationship between readings and sp. gravity). The Twaddell scale is only used for liquids with specific gravity greater than that of water.

  4. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    hydrometer: specific gravity of liquids (density of liquids) hygrometer: humidity inclinometer: angle of a slope inkometer: ink interferometer: wave interference infrared thermometer: heat radiated katharometer: composition of gases lactometer: specific gravity of milk light meter: light (in photography) linear position transducer: speed of ...

  5. Lead–acid battery - Wikipedia

    en.wikipedia.org/wiki/Lead–acid_battery

    A hydrometer can be used to test the specific gravity of each cell as a measure of its state of charge. Because the electrolyte takes part in the charge-discharge reaction, this battery has one major advantage over other chemistries: it is relatively simple to determine the state of charge by merely measuring the specific gravity of the ...

  6. Baumé scale - Wikipedia

    en.wikipedia.org/wiki/Baumé_scale

    −100 °Bé (specific gravity, 0.615) would be among the lightest fluids known, such as liquid butane. Thus, the system could be understood as representing a practical spectrum of the density of liquids between −100 and 100, with values near 0 being the approximate density of water.

  7. Here are 12 well-known companies that went bankrupt in 2024 - AOL

    www.aol.com/12-well-known-companies-went...

    The best laundry detergent sheets of 2025. AOL. Where to shop today's best deals: Kate Spade, Amazon, Walmart and more. AOL. The best under-$50 clothing items to buy at Amazon right now.

  8. Here's the Christmas town where Santa’s elves answer ... - AOL

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    American Culture Quiz: Test Yourself On Frozen Firsts, Santa Scholars And Constitutional Achievements Letters are answered in the building's backroom, a space where the magic of Santa is kept ...

  9. Battery tester - Wikipedia

    en.wikipedia.org/wiki/Battery_tester

    Battery tester. A battery tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.

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