Definition:Roman Weights and Measures/Mass
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Definition
The Roman units of mass are as follows:
Calcus
- $1$ calcus $= \dfrac 1 8$ scrupulus.
Its value in modern units is estimated to be approximately $2.2$ grains, or approximately $0.14$ grams.
Siliqua
Its value in modern units is estimated to be approximately $2.9$ grains, or approximately $0.19$ grams.
Its modern equivalent is the carat.
Scrupulus
Its value in modern units is estimated to be approximately $17.6$ grains, or approximately $0.14$ grams.
Uncia
Its value in modern units is estimated to be approximately $423$ grains or $27.4$ grams.
Libra
- $1$ libra $= 12$ unciae.
Its value in modern units is estimated to be approximately $5 \, 076$ grains or $329$ grams.