A pint glass is a drinking vessel holding a British pint (568ml; ≈1.2 US pints) of liquid and is usually used for beer.
UK law requires certain steps be taken to ensure that a pint of beer is indeed a pint. Though this can be achieved using so-called "metered dispense" (calibrated pumps), the more normal solution is to use certified one-pint glasses. These have a crown stamp and number etched upon them. The number relates to the authority certifying the capacity of the glass (see and [http://www.nwml.gov.uk/docs/enforcement/the%20approved%20verifier%20register%20december%202005.pdf (PDF)). Selling beer in unmeasured glasses without using some other form of calibrated measure is illegal. Slightly cheaper non-stamped glasses are also made for use at home. Half-pint glasses are also available, and are subject to the same laws.
Despite this emphasis on accurately measured glasses, it is unfortunately common for drinkers to be served less than a full pint of liquid - either because too much of the glass is taken up by a foamy "head", or simply because the customer has been sold a short measure. This allows publicans (who are often under pressure from a management company) to "sell" more beer than is actually in the cask or keg and hence save money. At present, those selling "pints" up to ten percent short will not be prosecuted in the UK *.
For those wishing to avoid this practice while still serving beer with a large head, "lined" or "oversized" glasses are available. These have a line near the top (usually labelled "pint to line") to which the beer should be poured, with the head forming above it. In the past a number of breweries supplied these glasses to their pubs; this is now rarely the case (Banks's are a partial exception) and lined glasses are found mostly at enthusiasts' events such as beer festivals, serious cask ale pubs, and breweries' own bars. The use of lined pint glasses in pubs is advocated by the Campaign for Real Ale.
In Canada, where both British and US pint glasses may be found, some pubs will publicly advertise that they are "proud to serve Imperial pints".
568ml glasses are also used in the Republic of Ireland, where a Legal Metrology marks are used to show that a glass has passed inspection by the National Standards Authority of Ireland, a state-run body who enforce a number of standard rulings.
In Australia, the names and capacities of beer glasses vary state by state.
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