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Usually, there is a pattern of even distribution of marks on the chart, a phenomenon that is known as vowel dispersion. For most languages, the vowel system is triangular. Only 10% of languages, including English, have a vowel diagram that is quadrilateral. Such a diagram is called a vowel quadrilateral or a vowel trapezium. [2]
Since vowels are produced with an open vocal tract, the point where their production occurs cannot be easily determined. Therefore, they are not described in terms of a place of articulation but by the relative positions in vowel space. This is mostly dependent on their formant frequencies and less on the specific tongue position and lip rounding.
The vocal cords are composed of twin infoldings of 3 distinct tissues: an outer layer of flat cells that do not produce keratin (squamous epithelium). Below this is the superficial layer of the lamina propria , a gel-like layer, which allows the vocal fold to vibrate and produce sound.
Wöhler is also known for seminal contributions in organic chemistry, in particular, the Wöhler synthesis of urea. [2] His synthesis of the organic compound urea in the laboratory from inorganic substances contradicted the belief that organic compounds could only be produced by living organisms due to a "life force". [1]
Voiceless sonorants are rare; they occur as phonemes in only about 5% of the world's languages. [3] They tend to be extremely quiet and difficult to recognise, even for those people whose language has them. In every case of a voiceless sonorant occurring, there is a contrasting voiced sonorant.
Most vowels are voiced (i.e. the vocal folds are vibrating). Except in some marginal cases, the vocal tract is open, so that the airstream is able to escape without generating fricative noise. Variation in vowel quality is produced by means of the following articulatory structures:
Secondary articulation often has a strong effect on surrounding vowels, and may have an audible realization that precedes the primary consonant, or both precedes and follows it. For example, /akʷa/ will not generally sound simply like [akwa] , but may be closer to [awkwa] or even [awka] .
The vibration produced is an essential component of voiced consonants as well as vowels. If the vocal folds are drawn apart, air flows between them causing no vibration, as in the production of voiceless consonants. [6] The glottis is also important in the Valsalva maneuver. Voiced consonants include /v/, /z/, /ʒ/, /d͡ʒ/, /ð/, /b/, /d/, /ɡ ...
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