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  2. 1974 South African Grand Prix - Wikipedia

    en.wikipedia.org/wiki/1974_South_African_Grand_Prix

    The 1974 South African Grand Prix (formally the XX Lucky Strike Grand Prix of South Africa) was a Formula One motor race held at Kyalami on 30 March 1974. It was race 3 of 15 in both the 1974 World Championship of Drivers and the 1974 International Cup for Formula One Manufacturers.

  3. Poverty gap index - Wikipedia

    en.wikipedia.org/wiki/Poverty_Gap_Index

    By definition, the poverty gap index is a percentage between 0 and 100%. Sometimes it is reported as a fraction, between 0 and 1. A theoretical value of zero implies that no one in the population is below the poverty line. A theoretical value of 100% implies that everyone in the population has zero income.

  4. Aerosol - Wikipedia

    en.wikipedia.org/wiki/Aerosol

    The thoracic fraction is the proportion of the particles in ambient aerosol that can reach the thorax or chest region. [67] The respirable fraction is the proportion of particles in the air that can reach the alveolar region. [68] To measure the respirable fraction of particles in air, a pre-collector is used with a sampling filter.

  5. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    This time can be calculated by dividing the natural logarithm of 2 by the exponent of growth, or approximated by dividing 70 by the percentage growth rate [1] (more roughly but roundly, dividing 72; see the rule of 72 for details and derivations of this formula).

  6. Prime number theorem - Wikipedia

    en.wikipedia.org/wiki/Prime_number_theorem

    By July of that year, Selberg and Paul Erdős [12] had each obtained elementary proofs of the PNT, both using Selberg's asymptotic formula as a starting point. [ 9 ] [ 26 ] These proofs effectively laid to rest the notion that the PNT was "deep" in that sense, and showed that technically "elementary" methods were more powerful than had been ...

  7. Solubility table - Wikipedia

    en.wikipedia.org/wiki/Solubility_table

    Substance Formula 0 °C 10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C 100 °C Barium acetate: Ba(C 2 H 3 O 2) 2: 58.8: 62: 72: 75: 78.5: 77: 75

  8. Greenhouse gas - Wikipedia

    en.wikipedia.org/wiki/Greenhouse_gas

    This is an accepted version of this page This is the latest accepted revision, reviewed on 24 January 2025. Gas in an atmosphere with certain absorption characteristics This article is about the physical properties of greenhouse gases. For how human activities are adding to greenhouse gases, see Greenhouse gas emissions. Greenhouse gases trap some of the heat that results when sunlight heats ...

  9. 2015 Spanish local elections - Wikipedia

    en.wikipedia.org/wiki/2015_Spanish_local_elections

    +1 per each 100,000 inhabitants or fraction +1 if total was an even number Councillors of municipalities with populations below 250 inhabitants were elected under an open list partial block voting , with electors voting for individual candidates instead of parties: for up to four candidates in municipalities with populations between 100 and 250 ...