# What are 100 hectares called

## Hectares

That or that Hectares or the Hectares (Swiss) is a unit of measurement of area with the unit symbol ha. It is mainly used in agriculture and forestry.

### history

The word Hectares is off hectares (o) (for "hundred") and Ar composed and therefore means: 100 ares.[1]

1879 was the hectare included in its recommendations by the CIPM (Comité International des Poids et Mesures). Already before that the hectare Part of the order of measurements and weights of the North German Confederation of 1868.

Since the late 19th century, one hectare corresponded to exactly four acres in the German Empire, which is why it was also called quarter hectare (vha) to distinguish it from traditional dimensions.

### Conversions

One hectare corresponds to 10,000 square meters or 100 ares or one square hectometer. A square with an area of ​​1 hectare has a side length of 100 meters (1 hectometer).

1 ha = 100 a = 1 hm² = 0.01 km² = 10,000 m²
1 km² = 100 ha

### use

It is true that the area measure belongs Hectares not to the SI system of units, but it is approved for use with this.[2] The hectare is in Germany and Austria and as Hectares a legal unit in Switzerland, but limited to the indication of the area of ​​land and parcels.[3][4] According to the EEC guideline 80/181 / EEC, “hectare” is just a special name for one hundred times the ares, formed from the prefix Hecto For 100 and the unit name Ar.[5]

### Use with SI prefixes

The German unit ordinance sees Ar (unit symbol: a) and hectare (unit symbol: ha) as independent units and allows the use of SI prefixes for both. Thus, in Germany, formations such as hectoar (ha) and z. B. Centihektar (cha) legal but uncommon. It cannot be seen from the unit symbol ha whether it is Hectares or Hectares is meant, which makes no difference, since in both cases 10,000 m² are meant.

### Further (non-SI) area units in the same size range

• Ar: 1 a = 0.01 ha
• Acre: 1 acre = 0.40468564224 ha
• Morning: between 0.1906 and 1.178 ha, mostly between 0.3 and 0.4 ha, later to 0.25 ha
• Daily work: Calculated according to the Bavarian daily work (3407.27 m²), one hectare corresponds to about 3 days of work.
• A popular benchmark for the hectare is a soccer field, which is usually smaller:
• most common size for soccer fields: 68 meters by 105 meters = 0.714 ha,
• Minimum according to the rules: 45 meters by 90 meters = 0.405 ha,
• Maximum according to the rules: 90 meters by 120 meters = 1.080 ha.

### Individual evidence

1. ↑ entry Hectares in the Wiktionary
2. ↑ The International System of Units (SI). German translation of the BIPM brochure "Le Système international d‘unités / The International System of Units (8e edition, 2006)". In: PTB communications. 117, No. 2, 2007 (translated by Cecile Charvieux) (online version (PDF file, 1.4 MB)).
3. ↑ Appendix 1 of the "Implementing Ordinance to the Law on Units in Metrology and Time Determination (Units Ordinance - EinhV)"
4. ↑ Art. 18 of the Swiss Unit Ordinance
5. ↑ Consolidated version of the guideline (as of 2012)

### Web links

Wiktionary: hectares - Explanations of meanings, word origins, synonyms, translations