Airstream mechanism refers to the mechanism by which air pressure or airflow is created in order to power speech production. The most basic and universal is the pulmonic airstream mechanism, whereby the lungs power an egressive airflow that produces both an airstream and a heightened air pressure when the vocal tract is blocked. The glottalic airstream mechanism involves vertical movement of the larynx with closed glottis, pushing air upward or drawing air in. This mechanism produces ejectives (glottalized consonants) and implosives. The velaric airstream mechanism produces clicks and is powered by tongue movements. Esophageal speech is produced by a controlled release of air from the esophagus (i.e., belching) in which the vibration of the esophageal sphincter substitutes for the vibration of the vocal folds.

Phonetics is the science explaining what happens as people talk -- that is to say, what happens as we produce the sounds of speech. Speech is a functional part of language, as language is most commonly used in human interaction. Language, in an abstract sense, is something common to all neurotypical humans. This abstract sense of “language” contrasts with specific languages, each one unique. The level of phonetic analysis of language is separate from, but overlapping with, phonology. Phonology focuses more on contrasts, whereas phonetics focuses more on differences. Phonetic variables can be used at very different levels of the grammar in different languages. Traunmüller distinguishes four types of information in speech: phonetic (linguistic), affective, personal, and transmittal. Dialect, register, and the hyperspeech--hypospeech continuum affect specific aspects of phonetic production in a given language. The science of phonetics uses terminology often consisting of ordinary words whose meanings are frequently different from the technical sense.

This chapter explores the most well-known English constitutional text and the period that followed its enactment. It explores how Magna Carta was a much more mundane and feudal document than its reputation suggests. It also examines how it was by no means the sole kingly concession during this period and discusses the origins of Parliament and how this affected the common law. The chapter falls into three sections. The first section discusses the importance and effect of Magna Carta. It explores what Magna Carta said and what effect it had upon feudalism, the operation of courts, governance and upon immigration. The second section will then explore the debate concerning the role the charter played in the development of Parliament, examining what Magna Carta said and also the importance of alter developments during this period. The final section will examine the impact of the charter upon the position of women.

Vowels are one of two principal types of speech sound, the other being consonants. Vowels are typically produced with voicing, and with a vocal tract open at least as much as it is for the vowel [i]. Vowels are classified by height and frontness/backness, these terms referring to the highest point on the surface of the tongue. This range of space within the oral cavity is called the vowel quadrangle, based on its shape. Other characteristics are also used in the classification of vowels, besides these two principal ones. These include rounding/labialization, tenseness/ATR, nasalization, duration/length, and syllabicity. The group of front unrounded and back rounded vowels comprise what are called cardinal vowels or primary vowels; these are the most common vowels in the world’s languages. Secondary vowels include front rounded and back unrounded vowels. Nasalization of vowels involves opening the velopharyngeal port during their production.

The word consonant means 'with a sonant' or vowel. Consonants are one of two main types of speech sounds, the other being vowels. In the production of consonants, the vocal tract is blocked, the vocal tract is seriously constricted, or the airflow is diverted through the nasal passage. The term articulation is used for the movements and adjustments required to produce an individual speech sound. Consonants are classified by (1) whether the vocal folds are vibrating, (2) where in the vocal tract articulation takes place, and (3) the manner of articulation (the type of articulation). Manners of articulation include plosives, nasals, fricatives, and approximants, the latter of which can be broken down into laterals and glides. Other manners of articulation include trills. Consonants may be produced with a secondary articulation in addition to the primary articulation.