T enseness is the pronunciation of a vowel with less centralization (i.e. either more fronting or more backing), longer duration , and narrower mouth width (with the tongue being perhaps more raised ) compared with another vowel. The tense vowels are longer than lax vowels f or example, /i:/ in we (wi: ) is longer than the /ɪ/ in (‘bɪg). Some of those examples include this vowels i, e, o, u, ɔ, and ɑ. Law : /lɔ/ Spa: /spɑ/ Bay: /beɪ/ Bee: /bi/ Ray: /reɪ/ Too: /tu/