Rai (unit)
From HandWiki
Short description: Unit of area, equal to 1,600 square metres
A rai (Thai: ไร่, pronounced [râi]) is a unit of area equal to 1,600 square metres (16 ares, 0.16 hectares, 0.3954 acres), and is used in measuring land area for a cadastre or cadastral map.[1] 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 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. Although recognized by the International System of Units (SI), its use is not encouraged.[ambiguous][2] The word rai also means plantation.
See also
References
- ↑ Giblin, R. W. (2008). "Chapter Royal Survey Work.". in Wright, Arnold; Breakspear, Oliver T. Twentieth century impressions of Siam. London: Lloyds Greater Britain Publishing Company. http://www.ebooksread.com/authors-eng/arnold-wright/twentieth-century-impressions-of-siam-its-history-people-commerce-industries-hci/page-23-twentieth-century-impressions-of-siam-its-history-people-commerce-industries-hci.shtml. Retrieved January 28, 2012. "It so happens that 40 metres or 4,000 centimetres are equal to one sen, so all cadastral plans are plotted, drawn, and printed to a scale of 1:4,000."
- ↑ "SI Units – Area" (in en). NIST. 2021-03-25. https://www.nist.gov/pml/owm/metric-si/si-units-area.
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