The metric system was officially introduced by a law passed on December 17, 1923. Thai units are still in use, for measurements of land and gold.
Thai Weights and Measures
Baht is an ancient weight measure. It is currently used for precious metals like Gold.
The traditional units convert into metric units as follows
1 picul = 60 kg
1 catty = 600 grams (100 catty = 1 picul)
1 baht (named like the currency, used to weigh gold) = 15.16 grams
1 carat = 20 centigrams (5 carat = 1 gram)
1 sen = 40 meters
1 wah = 2 meters (20 wah = 1 sen)
1 sauk (¼ wah) = 0.50 meter
1 keup (½ sauk) = 0.25 meter
1 rai (1 sq sen) = 1,600 sq meters= .39 acre
1 ngan (¼ rai) = 400 sq meters
1 sq wah = 4 sq meters (100 sq wah = 1 ngan)
1 kwien = 2,000 liters
1 ban = 1,000 liters (2 ban = 1 kwien)
1 sat = 20 liters (50 sat = 1 ban)
1 tannan = 1 liter (20 tannan = 1 sat).
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