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  2. List of countries by birth rate - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_birth...

    Crude birth rate refers to the number of births over a given period divided by the person-years lived by the population over that period. It is expressed as number of births per 1,000 population.

  3. Catastrophic cancellation - Wikipedia

    en.wikipedia.org/wiki/Catastrophic_cancellation

    double x = 1.000000000000001; // rounded to 1 + 5*2^{-52} double y = 1.000000000000002; // rounded to 1 + 9*2^{-52} double z = y-x; // difference is exactly 4*2^{-52} The difference 1.000000000000002 − 1.000000000000001 {\displaystyle 1.000000000000002-1.000000000000001} is 0.000000000000001 = 1.0 × 10 − 15 {\displaystyle 0.000000000000001 ...

  4. Molar concentration - Wikipedia

    en.wikipedia.org/wiki/Molar_concentration

    In the International System of Units (SI), the coherent unit for molar concentration is mol/m 3. However, most chemical literature traditionally uses mol/dm 3, which is the same as mol/L. This traditional unit is often called a molar and denoted by the letter M, for example: 1 mol/m 3 = 10 −3 mol/dm 3 = 10 −3 mol/L = 10 −3 M = 1 mM = 1 ...

  5. Pi - Wikipedia

    en.wikipedia.org/wiki/Pi

    The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

  6. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    The stars in the innermost 10,000 light-years form a bulge and one or more bars that radiate from the bulge. The Galactic Center is an intense radio source known as Sagittarius A*, a supermassive black hole of 4.100 (± 0.034) million solar masses.

  7. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    3.94–4.43 0.631–0.710 Medium-wave UV, mostly absorbed by the ozone layer: intermediate UV; Dorno radiation. UVB 280–315 Ultraviolet C 4.43–12.4 0.710–1.987 Short-wave UV, germicidal UV, ionizing radiation at shorter wavelengths, completely absorbed by the ozone layer and atmosphere: hard UV. UVC 100–280 Near ultraviolet 3.10–4.13

  8. List of countries by carbon dioxide emissions - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    [4] The data only consider carbon dioxide emissions from the burning of fossil fuels and cement manufacture , but not emissions from land use, land-use change and forestry . [ n 2 ] Over the last 150 years, estimated cumulative emissions from land use and land-use change represent approximately one-third of total cumulative anthropogenic CO 2 ...

  9. List of countries by minimum wage - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    General minimum wage by territory, as of February 2023. This is a list of the official minimum wage rates of the 193 United Nations member states and former members of the United Nations, also including the following territories and states with limited recognition (Northern Cyprus, Kosovo, etc.) and other independent countries.