[[Ketegangan]] ialah perbandingan
Unlike the other features of vowel quality, tenseness is only applicable to the few languages that have this opposition (mainly [[Germanic language]]s, e.g. [[English language|English]]), whereas the vowels of the other languages (e.g. [[Spanish language|Spanish]]) cannot be described with respect to tenseness in any meaningful way. In discourse about the English language, "tense and lax" are often used interchangeably with "long and short", respectively, because the features are concomitant in the common varieties of English. This cannot be applied to all English dialects or other languages.
In most [[Germanic languages]], lax vowels can only occur in closed [[syllables]]. Therefore, they are also known as [[checked vowel]]s, whereas the tense vowels are called [[free vowel]]s since they can occur in any kind of syllable.