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A ''rai'' ( th, ไร่, ) is a unit of
area Area is the quantity that expresses the extent of a region on the plane or on a curved surface. The area of a plane region or ''plane area'' refers to the area of a shape or planar lamina, while '' surface area'' refers to the area of an open ...
equal to 1,600
square metre The square metre ( international spelling as used by the International Bureau of Weights and Measures) or square meter ( American spelling) is the unit of area in the International System of Units (SI) with symbol m2. It is the area of a square ...
s (16
ares Ares (; grc, Ἄρης, ''Árēs'' ) is the List of Greek mythological figures, Greek god of war god, war and courage. He is one of the Twelve Olympians, and the son of Zeus and Hera. The Greeks were ambivalent towards him. He embodies the p ...
, 0.16
hectare The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), or 10,000 m2, and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. An acre is a ...
s, 0.3954 acres), and is used in measuring land area for a
cadastre A cadastre or cadaster is a comprehensive recording of the real estate or real property's metes-and-bounds of a country.Jo Henssen, ''Basic Principles of the Main Cadastral Systems in the World,'/ref> Often it is represented graphically in a cad ...
or cadastral map. Its current size is precisely derived from the
metre The metre ( British spelling) or meter ( American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its pr ...
, but is neither part of nor recognized by the modern
metric system The metric system is a system of measurement that succeeded the decimalised system based on the metre that had been introduced in France in the 1790s. The historical development of these systems culminated in the definition of the Intern ...
, the International System (SI). The rai is defined as 1 square ''sen'' or (40 m × 40 m). It can be divided in four '' ngaan'' or 400 square '' wa''. It is commonly used in
Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is b ...
. Although recognized by the SI, its use is not encouraged. The word ''rai'' also means
plantation A plantation is an agricultural estate, generally centered on a plantation house, meant for farming that specializes in cash crops, usually mainly planted with a single crop, with perhaps ancillary areas for vegetables for eating and so on. The ...
.


See also

*
Thai units of measurement Thailand adopted the metric system on 17 December 1923.Orders of magnitude (area) This page is a progressive and labelled list of the SI area orders of magnitude, with certain examples appended to some list objects. to square metres 10−8 to 10−1 square metres 100 to 107 square metres 108 to 1014 square metres 101 ...


References


External links


Area metric conversion
British and U.S., Japanese, Chinese, Thai, old French, others. {{DISPLAYTITLE:''Rai'' (unit) Units of area Thai units of measurement