Rai (area)
Encyclopedia
A rai is a unit of area
, equal to 1,600 square metre
s (40 m × 40 m), used for measuring land area. Its current size is precisely derived from the metre
, but is neither part of nor recognized by the modern metric system
, the International System
(SI).
The rai equals 4 ngaan
or 400 tarangwa
aka square wa.
It is commonly used in Thailand
and equals 16 are
, another unit based on the metre and as commonly used in several countries recognized though not encouraged by the SI. The word also means plantation
.
Area
Area is a quantity that expresses the extent of a two-dimensional surface or shape in the plane. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape, or the amount of paint necessary to cover the surface with a single coat...
, equal to 1,600 square metre
Square metre
The square metre or square meter is the SI derived unit of area, with symbol m2 . It is defined as the area of a square whose sides measure exactly one metre...
s (40 m × 40 m), used for measuring land area. Its current size is precisely derived from the metre
Metre
The metre , symbol m, is the base unit of length in the International System of Units . Originally intended to be one ten-millionth of the distance from the Earth's equator to the North Pole , its definition has been periodically refined to reflect growing knowledge of metrology...
, but is neither part of nor recognized by the modern metric system
Metric system
The metric system is an international decimalised system of measurement. France was first to adopt a metric system, in 1799, and a metric system is now the official system of measurement, used in almost every country in the world...
, the International System
Si
Si, si, or SI may refer to :- Measurement, mathematics and science :* International System of Units , the modern international standard version of the metric system...
(SI).
The rai equals 4 ngaan
Ngaan
A ngan is a unit of area, equal to 400 square metres , used for measuring land or property area. Its current size is precisely derived from the metre, but is neither part of nor recognized by the modern metric system, the International System .The ngan equals 1/4 rai or 100 tarangwa aka square wa,...
or 400 tarangwa
Tarangwa
A tarang wa or square wa, sometimes transliterated as 'waa' or 'wah' is a unit of area used in Thailand for measuring land or property. It is defined as the area of a square whose sides measure exactly one wa , equivalent to four square metres...
aka square wa.
It is commonly used in Thailand
Thailand
Thailand , officially the Kingdom of Thailand , formerly known as Siam , is a country located at the centre of the Indochina peninsula and Southeast Asia. It is bordered to the north by Burma and Laos, to the east by Laos and Cambodia, to the south by the Gulf of Thailand and Malaysia, and to the...
and equals 16 are
ARE
Are, ARE or Åre may refer to: United Arab Emirates using ISO 3166-1 alpha-3 country code*The second-person singular and plural forms of the verb "to be", copula of the English language...
, another unit based on the metre and as commonly used in several countries recognized though not encouraged by the SI. The word also means plantation
Plantation
A plantation is a long artificially established forest, farm or estate, where crops are grown for sale, often in distant markets rather than for local on-site consumption...
.
See also
- 1 E+3 m² for a comparison with other areas
- Area metric conversion, British and U.S., Japanese, Chinese, Thai, old French, old Spanish, old Russian, etc.