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  2. Hectare - Wikipedia

    en.wikipedia.org/wiki/Hectare

    The hectare (/ ˈ h ɛ k t ɛər,-t ɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm 2), that is, 10,000 square metres (10,000 m 2), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is about 0.405 hectares and one hectare contains about ...

  3. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...

  4. Acre - Wikipedia

    en.wikipedia.org/wiki/Acre

    The entire yellow square is one square mile; the dark blue area at right represents 100 acres. The acre (/ ˈeɪkər / AY-kər) is a unit of land area used in the British imperial and the United States customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 10 square ...

  5. Section (United States land surveying) - Wikipedia

    en.wikipedia.org/wiki/Section_(United_States...

    The primary grid pattern is of quarter sections (1⁄2 mi × 1⁄2 mi (800 m × 800 m)). In U.S. land surveying under the Public Land Survey System (PLSS), a section is an area nominally one square mile (2.6 square kilometers), containing 640 acres (260 hectares), with 36 sections making up one survey township on a rectangular grid. [1]

  6. Population density - Wikipedia

    en.wikipedia.org/wiki/Population_density

    Population density is the number of people per unit of area, usually transcribed as "per square kilometer" or square mile, and which may include or exclude, for example, areas of water or glaciers. Commonly this is calculated for a county, city, country, another territory or the entire world. The world's population is around 8,000,000,000 [ 3 ...

  7. Area formulas - Wikipedia

    en.wikipedia.org/wiki/Area

    The acre is also commonly used to measure land areas, where 1 acre = 4,840 square yards = 43,560 square feet. An acre is approximately 40% of a hectare. On the atomic scale, area is measured in units of barns, such that: [13] 1 barn = 10 −28 square meters. The barn is commonly used in describing the cross-sectional area of interaction in ...

  8. Acre-foot - Wikipedia

    en.wikipedia.org/wiki/Acre-foot

    The acre-foot is a non- SI unit of volume equal to about 1,233 m 3 commonly used in the United States in reference to large-scale water resources, such as reservoirs, aqueducts, canals, sewer flow capacity, irrigation water, [1] and river flows. An acre-foot equals approximately an eight-lane swimming pool, 82 ft (25 m) long, 52 ft (16 m) wide ...

  9. Morgen - Wikipedia

    en.wikipedia.org/wiki/Morgen

    A morgen was a unit of measurement of land area in Germany, the Netherlands, Poland, Lithuania and parts of the Dutch Overseas Empire, such as South Africa. The size of a morgen varies from ⁄ to 2⁄ acres (2,000 to 10,100 m 2). It was also used in Old Prussia, in the Balkans, Norway and Denmark, where it was equal to about two-thirds acre ...