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
Articles by others on the same topic
There are currently no matching articles.