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  2. 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 ...

  3. Hydrometer - Wikipedia

    en.wikipedia.org/wiki/Hydrometer

    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.

  4. Baumé scale - Wikipedia

    en.wikipedia.org/wiki/Baumé_scale

    +100 °Bé (specific gravity, 3.325) would be among the densest fluids known (except some liquid metals), such as diiodomethane. Near 0 °Bé would be approximately the density of water. −100 °Bé (specific gravity, 0.615) would be among the lightest fluids known, such as liquid butane.

  5. API gravity - Wikipedia

    en.wikipedia.org/wiki/API_gravity

    API gravity is graduated in degrees on a hydrometer instrument. API gravity values of most petroleum liquids fall between 10 and 70 degrees. In 1916, the U.S. National Bureau of Standards accepted the Baumé scale, which had been developed in France in 1768, as the U.S. standard for measuring the specific gravity of liquids less dense than water.

  6. 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.

  7. Beer measurement - Wikipedia

    en.wikipedia.org/wiki/Beer_measurement

    A hydrometer floating in a test jar of wort, where the specific gravity reading is approximately 1.050. The principal factors that characterize beer are bitterness, the variety of flavours present in the beverage and their intensity, alcohol content, and colour.

  8. Normal Pulse Oximetry Ranges and How to Take a Reading - AOL

    www.aol.com/lifestyle/normal-pulse-oximetry...

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  9. Brix - Wikipedia

    en.wikipedia.org/wiki/Brix

    As specific gravity was the basis for the Balling, Brix and Plato tables, dissolved sugar content was originally estimated by measurement of specific gravity using a hydrometer or pycnometer. In modern times, hydrometers are still widely used, but where greater accuracy is required, an electronic oscillating U-tube meter may be employed.