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  2. 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.

  3. Sieve analysis - Wikipedia

    en.wikipedia.org/wiki/Sieve_analysis

    A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...

  4. 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 ...

  5. Total Eclipse (1988 video game) - Wikipedia

    en.wikipedia.org/wiki/Total_Eclipse_(1988_video...

    Total Eclipse was the third game to use the Freescape engine, which allowed the production of full three-dimensional environments using filled polygons in which the player could move around freely. However, the engine was improved for this release, adding spheres to the collection of shapes used for building the 3D environments.

  6. Submerged specific gravity - Wikipedia

    en.wikipedia.org/wiki/Submerged_specific_gravity

    Submerged specific gravity is equal to the specific gravity given by the ratio of the weight of the object to the weight of the fluid) minus one. That is, the object and fluid have the same density when the specific gravity equals one, and the submerged specific gravity equals zero.

  7. Vickers hardness test - Wikipedia

    en.wikipedia.org/wiki/Vickers_hardness_test

    The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials. [1] The Vickers test is often easier to use than other hardness tests since the required calculations are independent of the size of the indenter, and the indenter ...

  8. Eddington experiment - Wikipedia

    en.wikipedia.org/wiki/Eddington_experiment

    The 29 May 1919 solar eclipse. The Eddington experiment was an observational test of general relativity, organised by the British astronomers Frank Watson Dyson and Arthur Stanley Eddington in 1919.

  9. Expanded clay aggregate - Wikipedia

    en.wikipedia.org/wiki/Expanded_clay_aggregate

    Cleaned root ball and main stem sitting atop the total amount of aggregate used to grow a single plant LECA is usually produced in different sizes and densities from 0.1 millimetres (0.004 in) up to 25 millimetres (1.0 in), commonly 0–4 mm, 4–10 mm, 10–25 mm and densities of 250, 280, 330, and 510 kg/m 3 .