thang

Compare thăng, thùng.

In Southeast Asia, a unit of capacity.

1

In Cambodia, a unit of dry capacity used for paddy (unthreshed rice), approximately 30 liters.  Earlier sources say 40 liters.

United Nations, 1966.

2

[Thai ถัง] In Thailand, a unit of dry capacity, since the metric standardization of 1923 = 20 liters. Usually called a sat, sometimes a thangsatchart symbol

The word “thangsat” also means “bucket.” The legal measure was 10 × 10 × 20 niu, or 2000 cubic niu, or in the period when the niu was based on 1 wah = 80 inches, about 1157.4074 cubic inches (about 18.967 liters). At the request of the Siamese government, two standard thangsats were measured by the Standards Dept. of the English Board of Trade in 1876, and found to contain 1159.88477 and 1156.959 cubic inches at 85° F.

In the 19th century a distinction seems to have been made between the thang and the thangsat; 1 thangsat = 1¼ thang.

United Nations, 1966.

W. A. Browne, 1879.

The values in Browne's text are inconsistent with those in his table (page 274; for Browne's table, see the chart.). The text says the thangsat is 1157.4074 cubic inches, which is consistent with a niu of 5/6 inch. The table says the thangsat is 4.1743 [imperial] gallons, which would be 1158.03242 cubic inches. The table also states a thang is equivalent to 20 thanans, which makes sense even though one measure is liquid and the other dry, since 20 100-cubic-niu thanans = 1 2000-cubic-niu thang. The thang is said to be 3.75 [imperial] gallons, which would be 1040.3233 cubic inches, which is about 117 cubic inches less than 2000 cubic 5/6 inch nius. 

It seems likely that the values in the text are legal and theoretical ones, while the values in the table are taken from trade. The value "3.75" for the number of imperial gallons in a thang is, in the context of 1.6685 and 4.1743, a suspiciously round number, and may well have been the actual conversion factor used in commerce. 

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