beqa

In Egypt, a unit of mass used for gold, about 13 grams.

sources

The beqa, which was calculated by Petrie at between 12.18 and 13.61 grams,9 was a unit whose primary function was the evaluation of gold and gold dust; it is arguably the oldest and longest-lived unit of weight known. ...

…this unit was multiplied decimally (denominations of 10, 20, 40, 50, 100, and 200 units are common) and divided binarily (1/2, 1/4, 1/8, 1/16 units are typical).12

9. Flinders Petrie, Ancient Weights and Measures, pages 17-19,

12. Petrie, tables XL-XLI.

Karl M. Petruso.
Early Weights and Weighing in Egypt and the Indus Valley.
M Bulletin (Museum of Fine Arts, Boston), vol. 79, pages 44-51 (1981).

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