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  2. Estimates of historical world population - Wikipedia

    en.wikipedia.org/wiki/Estimates_of_historical...

    Published estimates for the 1st century ("AD 1") suggest uncertainty of the order of 50% (estimates range between 150 and 330 million). Some estimates extend their timeline into deep prehistory, to " 10,000 BC", i.e., the early Holocene , when world population estimates range roughly between 1 and 10 million (with an uncertainty of up to an ...

  3. Hydraulic jumps in rectangular channels - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_Jumps_in...

    As water hits the sink, it disperses, increasing in depth to a critical radius where the flow (supercritical with low depth, high velocity, and a Froude number greater than 1) must suddenly jump to a greater, subcritical depth (high depth, low velocity, and a Froude number less than 1) that is known to conserve momentum. Figure 2.

  4. List of Solar System objects by size - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System...

    The known icy moons in this range are all ellipsoidal (except Proteus), but trans-Neptunian objects up to 450–500 km radius may be quite porous. [10] For simplicity and comparative purposes, the values are manually calculated assuming that the bodies are all spheres. The size of solid bodies does not include an object's atmosphere.

  5. List of continents and continental subregions by population

    en.wikipedia.org/wiki/List_of_continents_and...

    0 4 1 Micronesia [r] 534,606: 0.007% N/A 5 0 1 2 Antarctica: 0: 0% 0% 0 0 0 1 Global, continental, and subregional totals from 1950 to 2021 Africa. Eastern Africa ...

  6. FM broadcast band - Wikipedia

    en.wikipedia.org/wiki/FM_broadcast_band

    The 4-meter band (70–70.5 MHz) amateur radio allocation used in many European countries is entirely within the OIRT FM band. Operators on this band and the 6-meter band (50–54 MHz) use the presence of broadcast stations as an indication that there is an "opening" into Eastern Europe or Russia. This can be a mixed blessing because the 4 ...

  7. Demographics of California - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_California

    The size of the Armenian American population is disputed, however. According to a 1988 news article, California had about 500,000 ethnic Armenians with over half of them living in Greater Los Angeles. [58] More than 1,300,000 Jewish Americans live in California, the majority of whom are Ashkenazi Jews. [59]

  8. Four Thirds system - Wikipedia

    en.wikipedia.org/wiki/Four_Thirds_system

    The usual size of the sensor is 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm, giving a diagonal of 21.64 mm. [17] [18] The sensor's area is about 30–40% smaller than APS-C sensors used in most other DSLRs, but still around 9 times larger than the 1/2.5" sensors typically used in compact digital cameras.

  9. Demographics of England - Wikipedia

    en.wikipedia.org/wiki/Demographics_of_England

    The population of England in 2021 was estimated to be 56,489,800. [4] [5] This is the most recent census. [4]In the previous census, in 2011, the population was 53,012,456. ...