coyan or koyan

A unit of mass in Southeast Asia. In Sarawak, 3,098 pounds.

1

In Thailand, since 1923 a unit of mass, the standard koyan = 1200 kilograms. a unit of capacity = 80 thangsat = 2,645.54715 lb.

Earlier values:

The Bangkok coyan, used for rice and salt, 16.6305 koku.

sources

1

The coyan, which is in reality a measure of capacity, is often used to designate a multiple of the hap [a unit of mass]. It is generally equal to 20 hap, although it ranges from 18 to 22 hap. The coyan of paddy is reckoned at about 16.6 hap and considered equal to 2133¹⁄₃ lbs.

Blockhuys, 1924. Page 61.

The last sentence requires a hap of ~128 pounds avoirdupois. The legal weight of the hap was 133.75 pounds avoirdupois, making the coyan of 18 hap = 2407.5 lb av; of 20 hap = 2675 lb. av.; of 22 hap = 2942.5 lb. av.

     
premetric coyan 20 piculs approximately 1,213.36 kilograms
coyan for rice 22 piculs approximately 1,334.7 kilograms
coyan for salt 25 piculs about 1,516.7 kilograms

2

Rice is sold by the coyan of one hundred baskets: a basket is supposed to be sufficient for the food of a man during a month.

John Bowring.
The Kingdom and People of Siam. Vol. 1.
London: 1857.
Page 202.

2

In Burma, 19th century, a unit of capacity = 100 tengs = 100 imperial bushels, about 3.637 cubic meters.

3

In Malaysia, the koyan, a unit of capacity = 40 pikuls or about 800 gantangs. The spelling is that of the 1972 spelling reform.

4

In the Netherlands East Indies, 19th – early 20th centuries, a measure of capacity for rice, grain and salt, varying by locality (ostensibly, it represents a weight of 30 picols).

   
Batavia coyan 27 picols
Samarang coyan 28 picols
Soerabaya coyan 30 picols

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