How many units of alcohol are there in a bottle of Appleton Special Rum 70cl / 40% proof?

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1 unit is 1% alcohol per litre,

40% is 40 units per litre.

in 70cl you have 28 units.

1 unit is 10 ml of 1%

70cl of 40% = 70 / 10 * 4

Any 70cl bottle of 40% ABV spirits contain 28 units.

40% proof is a different thing. It’s 20 % ABV (alcohol by volume).

Nope, 10 ml is not an unit. However it may be either 40 ml or 30 ml .. So either 18 or 23 😀