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  2. Hydrometer - Wikipedia

    en.wikipedia.org/wiki/Hydrometer

    Schematic drawing of a hydrometer. The lower the density of the fluid, the deeper the weighted float B sinks. The depth is read off the scale A.. A hydrometer or lactometer is an instrument used for measuring density or relative density of liquids based on the concept of buoyancy.

  3. API gravity - Wikipedia

    en.wikipedia.org/wiki/API_gravity

    Hydrometer selection: An appropriate API gravity hydrometer is chosen based on the expected range of the sample. These hydrometers are typically calibrated to read API gravity directly. [7] Measurement: The hydrometer is gently lowered into the sample contained in a cylindrical vessel. It is allowed to float freely until it reaches equilibrium.

  4. Gravitic density meter - Wikipedia

    en.wikipedia.org/wiki/Gravitic_density_meter

    A displacement measurement device, usually a high precision laser or load cell, is used to measure how much change has occurred in the system. By calculating the change of deflection of the hose, a gravitic density meter can be used to find the real time, continuous density. Gravitic density meters do not measure the specific gravity directly ...

  5. 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 ...

  6. 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.

  7. 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 ...

  8. 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)

  9. 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.

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