Vowels:
Sounds in which there is no obstruction to the flow of air as it passes from the larynx to the lips.
Vowels differ from each other (Shape and Position of the Tongue):
- first, the vertical distance between the upper surface of the tongue and the palate.
- second, the part of the tongue , between front and back, which is raised highest.
Some Examples for the Vowel Sounds:
Cardinal Vowels:
a set of vowels arranges in a close-open, front-back diagram. they are a standard reference system.