Phonetics is the study of phonic substance and its function in spoken language. In theory it is useful to differentiate between phonetics, which studies phonic substance, and phonology , which studies the selection and organization of phonic substance into a given form or pattern. ( Diana Finch)
Phonetics is the scientific study of speech. It has a long history, going back certainly to well over two thousand years ago. The central concerns in phonetics are the discovery of how speech sounds are produced, how they are used in spoken language, how we can record speech sounds with written symbols and how we hear and recognise different sounds. (Peter Roach)
Articulatory phonetics
This figure shows that the entire speech apparatus is made up of a series of organs and cavities that form a passage from the lungs to the lips and nostrils. The section of this passage extending from the larynx upwards is called the vocal tract. When we inhale, the air enters though the nose and /or mouth, then passes through the pharynx, the larynx and the trachea, into the lungs.
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