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Imperial pint 2026-10-31

One eighth of an Imperial gallon, containing 20 fluid ounces.

Past exam of the medicine course of the University of Oxford / 1864 / Second examination / Materia medica, pharmacy / 10 / Solution 2026-10-31

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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 relations for solids are

1 lb = 16 oz = 7000 gr, 1 oz = 437.5 gr .

(1)

Their approximate French metric equivalents are:

one grain: $0.0648 g$ , about $64.8 mg$ ;
one avoirdupois ounce: $28.35 g$ ;
one avoirdupois pound: $453.59 g$ .

For liquids,

1 gal = 8 pt, 1 pt = 20 fl oz, 1 fl oz = 8 fl dr, 1 fl dr = 60 min .

(2)

The approximate metric volumes are:

one minim: $0.0592 mL$ ;
one fluid drachm: $3.552 mL$ ;
one fluid ounce: $28.41 mL$ ;
one Imperial pint: $568.26 mL$ ;
one Imperial gallon: $4.5461 L$ .

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]

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