English speech sounds are formed by modifying in some way the stream of air which is forced out of the lungs through the oral and/or nasal cavities. Sounds created using this type of air flow are said to be made by using a pulmonic egressive airstream mechanism
consonants are speech sounds produced with a narrowing of the vocal track which is sufficient to prevent them functioning as syllable nuclei. The nucleus of the syllable is the heart of the syllable. It carries the stress, loudness and pitch. The syllable nucleus is ususally a vowel. When we describe a consonant sound it is necessary to provide information about three different aspects of how the sound in made