Units are a simple way of expressing the quantity of pure alcohol in a drink.
One unit equals 10ml or 8g of pure alcohol, which is around the amount of alcohol the average adult can process in an hour.
READ RELATED: Mother-of-two, 28, reveals how a hug with her son saved her life after spotting a lump
This means that within an hour there should be, in theory, little or no alcohol left in the blood of an adult, although this will vary from person to person.
The number of units in a drink is based on the size of the drink, as well as its alcohol strength.
Source: Daily Express
