Original question.
Give the equivalents of the weights and measures employed in the British Pharmacopœia, in French weights and measures.
The 1864 solid units are the avoirdupois pound, avoirdupois ounce and grain; the liquid units are the Imperial measures. The grain is unchanged, while the old apothecaries' pound and ounce are not the units of the new formulary. [ref]
The Prescriber's Analysis of the British Pharmacopoeia by John Birkbeck Nevins (1864). pp. 16–17, change of weights and unchanged liquid measures
- one grain: , about ;
- one avoirdupois ounce: ;
- one avoirdupois pound: .
- one minim: ;
- one fluid drachm: ;
- one fluid ounce: ;
- one Imperial pint: ;
- one Imperial gallon: .
A millilitre is a cubic centimetre, and a litre is a cubic decimetre. These displayed equivalents are rounded; small differences from a period table's last digits reflect rounding and historical calibration conventions. A fluid ounce is a volume and an avoirdupois ounce is a mass. They cannot be interchanged for an arbitrary liquid without its density. Likewise, a drop is not a defined minim: its volume depends on the liquid and the dropper.
[ref]
NIST Guide to the SI. Appendix B.8, grain, avoirdupois pound and ounce, Imperial gallon and fluid measures; modern rounded metric conversions
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