Hectare
From Wikipedia, the free encyclopedia
| Unit | SI | SI base |
|---|---|---|
| 1 ca | 1 m2 | 1 m2 |
| 1 a | 1 dam2 | 102 m2 |
| 1 ha | 1 hm2 | 104 m2 |
| 100 ha | 1 km2 | 106 m2 |
| non-SI comparisons | ||
| non-SI | metric | SI base |
| 0.00386102 sq mi | 1 ha | 104 m2 |
| 2.471 acre | 1 ha | 104 m2 |
| 107,639 sq ft | 1 ha | 104 m2 |
A hectare (symbol ha, pronounced /ˈhɛktɛər/) is a unit of area equal to 10,000 square metres (107,639 sq ft), or one square hectometre (100 metres, squared), and is commonly used for measuring land area.
The hectare is used in most countries around the world[citation needed], especially in domains concerned with land ownership, land planning, and management, including law (land deeds), agriculture, forestry, and town planning. In similar applications, the United States, Great Britain, Ireland[citation needed], Myanmar, and to some extent Canada instead use the Imperial measurement acre, which equals 0.404686 ha. Some of the former Ottoman countries and Norway use the decare, one tenth of a hectare.[citation needed]
Its base unit, the are, was defined by older forms of the metric system, but is no longer part of the modern metric system. The Comité International des Poids et Mesures classifies the hectare as a unit that is accepted for use with SI.[1]
Even in countries that have undergone a general conversion from traditional English measurements to metric measurements (e.g. Canada), legal descriptions relating to land, which frequently use the acre, have not been converted, as doing so would require a resurvey of the land, an activity which would destabilize the security of land titles.[citation needed]
Contents |
[edit] International use
The hectare has been subsequently defined in a number of nations by a country-specific term. In each of the following, the national unit of area has been defined as one hectare:[2]
- djerib in Turkey
- jerib in Iran
- gong qing in mainland China
- manzana in Argentina
- bunder in The Netherlands
[edit] Conversions
One hectare is equivalent to:
[edit] Metric
- 10,000 square metres
- 0.01 square kilometre
- 1 square hectometre
- 10 decares
- 100 ares
- 10,000 centiares
[edit] Imperial units
- 2.4710538 international acres
- 2.4710439 U.S. survey acres
- 107,639 square feet
- 0.00386102 square miles (statute)
[edit] Other
- 15 mǔ (Chinese)
- 0.15 qǐng
- 10 dunam or dönüm (Middle East)
- 10 stremmata (Greece)
- 6.25 rai (Thai)
- ≈ 1.008 chō (Japanese)
- 7.47 bigha (Bangladesh, India,Nepal)
[edit] See also
- 1 E+4 m² for further comparisons
- conversion of units
- hecto-
- Hectometre
- Orders of magnitude
[edit] References
- ^ Bureau International des Poids et Mesures (2006). The International System of Units (SI). 8th ed.. http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf. Retrieved 2008-02-13. Chapter 5.
- ^ Britannica, unit of measurement, accessed 2009-10-30
