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Why "glass" sounds different in British English
RP has /ɡlɑːs/, with the long back vowel; American English has /ɡlæs/. "Glass" is a regular BATH word, like "class", "grass" and "pass", where a long vowel comes before S.
The pattern is not a spelling rule, though. "Gas", "mass" and "lass" keep a short /æ/ in RP, and "glad" or "lad" never take the long vowel at all. The most reliable approach is to learn high-frequency BATH words individually. Note also that the plural "glasses" keeps the long vowel, /ˈɡlɑːsɪz/, and so does "glasshouse". In the North of England, "glass" has a short a, which British listeners hear immediately as a regional marker.
How to say "glass" like a Brit, step by step
- Make gl as a single cluster: back of the tongue for G, tip up for L.
- Drop the jaw into a long ah, keeping the lips neutral.
- Hold the s for a moment: glahs.
- For "glasses", keep the vowel long and add a short iz: GLAHS-iz.
Practise "glass" in a sentence
- Would you like a glass of wine?
- I can't read this without my glasses.
- Mind the broken glass on the pavement.
Saying it once correctly is easy. Saying it right in the middle of a fast sentence is the hard part, which is why the sentences above matter more than the single word.
Frequently asked questions
How do you pronounce glass in a British accent?
In Received Pronunciation, glass is pronounced /ɡlɑːs/, roughly "GLAHS". Glass has the long "ah" of "father", but "gas" keeps the short a.
Is the American pronunciation of glass wrong?
No. /ɡlæs/ is standard in American English. Both are correct, they simply belong to different accents. If you are learning a British accent, aim for /ɡlɑːs/.