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  2. Relative density - Wikipedia

    en.wikipedia.org/wiki/Relative_density

    Relative density, also called specific gravity, 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. Specific gravity for liquids is nearly always measured with respect to water at its densest (at 4 °C or 39.2 °F); for gases, the reference is air ...

  3. Relative species abundance - Wikipedia

    en.wikipedia.org/wiki/Relative_species_abundance

    Relative abundance is the percent composition of an organism of a particular kind relative to the total number of organisms in the area. [citation needed] Relative species abundances tend to conform to specific patterns that are among the best-known and most-studied patterns in macroecology. Different populations in a community exist in ...

  4. Scientific law - Wikipedia

    en.wikipedia.org/wiki/Scientific_law

    Scientific law. Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. [1] The term law has diverse usage in many cases (approximate, accurate, broad, or narrow) across all fields of natural science ( physics, chemistry, astronomy, geoscience ...

  5. Abundance (ecology) - Wikipedia

    en.wikipedia.org/wiki/Abundance_(ecology)

    Abundance (ecology) Effects of herbivore abundance in seagrass meadows. In ecology, local abundance is the relative representation of a species in a particular ecosystem. [1] It is usually measured as the number of individuals found per sample. The ratio of abundance of one species to one or multiple other species living in an ecosystem is ...

  6. Density - Wikipedia

    en.wikipedia.org/wiki/Density

    Density ( volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case Greek letter rho ), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [1] where ρ is the density, m is the mass, and V is the volume ...

  7. Leaf area index - Wikipedia

    en.wikipedia.org/wiki/Leaf_area_index

    Leaf area index. Leaf area index ( LAI) is a dimensionless quantity that characterizes plant canopies. It is defined as the one-sided green leaf area per unit ground surface area ( LAI = leaf area / ground area, m2 / m2) in broadleaf canopies. [1] In conifers, three definitions for LAI have been used: The definition “half the total leaf area ...

  8. Kinetic energy - Wikipedia

    en.wikipedia.org/wiki/Kinetic_energy

    where is the dynamic pressure, and ρ is the density of the incompressible fluid. Frame of reference. The speed, and thus the kinetic energy of a single object is frame-dependent (relative): it can take any non-negative value, by choosing a suitable inertial frame of reference. For example, a bullet passing an observer has kinetic energy in the ...

  9. Turbulence - Wikipedia

    en.wikipedia.org/wiki/Turbulence

    where c P is the heat capacity at constant pressure, ρ is the density of the fluid, μ turb is the coefficient of turbulent viscosity and k turb is the turbulent thermal conductivity. Kolmogorov's theory of 1941. Richardson's notion of turbulence was that a turbulent flow is composed by "eddies" of different sizes.

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