High Quality Content by WIKIPEDIA articles! A rai is a unit of area, equal to 1,600 square metres (40 m x 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 waa. 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. The International System of Units (abbreviated SI from the French le Systeme international d'unites) is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. It is the world's most widely used system of measurement, both in everyday commerce and in science.

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