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bak

In Laos, 20ᵗʰ century, a unit of mass, = 3.75 grams.

The bak and the houn are the only two Laotian units of mass used both in ordinary trade and in the opium business. In ordinary trade, bak is a synonym for salung, and 1 bak = 2 fuang = 10 houn = ¼ bat. In the opium trade, however, 1 bak = 10 houn = ¹/₁₀ bia or hong.

United Nations, 1966.