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  2. Hydrometer - Wikipedia

    en.wikipedia.org/wiki/Hydrometer

    A NASA worker using a hydrometer to measure the brine density of a salt evaporation pond. Modern hydrometers usually measure specific gravity but different scales were (and sometimes still are) used in certain industries. Examples include:

  3. Twaddell scale - Wikipedia

    en.wikipedia.org/wiki/Twaddell_scale

    On this scale, a specific gravity of 1.000 is reported as 0, and a specific gravity of 2.000 is reported as 200. [1] For example, concentrated sulfuric acid with a specific gravity of 1.8 has a Twaddell scale measurement of 160, reflecting the linear relationship between readings and specific gravity. The Twaddell scale is used exclusively for ...

  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. Baumé scale - Wikipedia

    en.wikipedia.org/wiki/Baumé_scale

    The relationship between specific gravity (s.g.; i.e., water-specific gravity, the density relative to water) and degrees Baumé is a function of the temperature. Different versions of the scale may use different reference temperatures. Different conversions formulae can therefore be found in various handbooks.

  6. Density meter - Wikipedia

    en.wikipedia.org/wiki/Density_meter

    A density meter does not measure the specific gravity of a sample directly. However, the specific gravity can be inferred from a density meter. The specific gravity is defined as the density of a sample compared to the density of a reference. The reference density is typically of that of water. The specific gravity is found by the following ...

  7. Talk:Hydrometer - Wikipedia

    en.wikipedia.org/wiki/Talk:Hydrometer

    I'm surprised that this article does not mention the hydrometer's use in measuring the specific gravity of freshwater or saltwater marine aquariums, especially considering that this is no doubt the most popular home-consumer use for the device. — Preceding unsigned comment added by 76.110.212.12 02:00, 18 August 2011 (UTC)

  8. Relative density - Wikipedia

    en.wikipedia.org/wiki/Relative_density

    A United States Navy Aviation boatswain's mate tests the specific gravity of JP-5 fuel. Relative density, also called specific gravity, [1] [2] is a dimensionless quantity defined as the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material.

  9. Hydrostatic bubbles - Wikipedia

    en.wikipedia.org/wiki/Hydrostatic_bubbles

    Hydrostatic bubbles, also known as philosophical bubbles, gravity beads, aerometrical beads and hydrometer beads, are a type of hydrometer invented in 1757 by Alexander Wilson of Glasgow. [1] The design was subsequently improved and patented by the glassblower and instrument maker Isabella Lovi [ 2 ] of Edinburgh in 1805. [ 3 ]

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