In phonetics, a vowel is a sound in spoken language, such as an English ah! [ɑː] or oh! [oʊ], pronounced with an open vocal tract so that there is no build-up of air pressure at any point above the glottis. This contrasts with consonants, such as English sh! [ʃː], where there is a constriction or closure at some point along the vocal tract. A vowel is also understood to be syllabic: an equivalent open but non-syllabic sound is called a semivowel. Here is the example picture of vowels:
Source taken from: http://en.wikipedia.org/wiki/Vowel
Source taken from: http://www.langsci.ucl.ac.uk/ipa/images/vowels.gif
MONOTHONGS AND DIPTHONGS
All languages have monophthongs and many languages have diphthongs. A vowel sound whose quality doesn't change over the duration of the vowel is called a monophthongs. Monophthongs are sometimes called "pure" or "stable" vowels. A vowel sound that glides from one quality to another is called a diphthongs.
Here is the example picture of monothongs:
And this is the example picture of dipthongs:
Source taken from: http://en.wikipedia.org/wiki/Vowel
Source taken from: http://biblescripture.net/Vowels.jpeg
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