Topic-027: Stop Oral and Nasal Stop refers to any sound which is produced by a complete closure in the vocal tract, and thus traditionally includes the class of plosives. Both nasal and oral sounds can be classified as stops, though the term is usually reserved for the latter. The term stop is used in the phonetic classification of consonant sounds on the basis of their manner of articulation (it refers to a sound made when a complete closure in the vocal tract is suddenly released the air pressure which had built up behind the closure rushes outwith an explosive sound. Thus the sound stop has two processes the closure of air passage stop) and the burst (release. Examples in English are p, b, t, d, kg. Plosion is the term used to refer to the outwards movement of air upon release. Plosive consonants are one type of stop consonant. Nasal stops include m, n, ŋ]. It is also possible (using a different airstream mechanism than the one which produces an outward flow of lung air) to produce plosives (implosives) where the air upon release moves inward.
