theoretical_phonetics / Scottish vowels

RP	Articulatory changes	Auditory changes	Phonological changes	Reason
i:
a:		The distinction of [a:]/[a]-[ǽ] doesn’t exist, hat [hat]	In words like arm, after, grass [ε] is preferable than [a:] e.g. [εftə]	Length is not a distinctive feature of Scottish English vowels. So pairs like pool – pull, cot – caught are not distinguished. It should be noted? However, that vowel are longer in final stressed open syllables than elsewhere.
o:
u:
ə:			[ə:] doesn’t occur since Scottish English is rhotic, it preserves post – vocalic [r] e.g. bird [bə:d] – [bird], hurt [hə:t] – [h۸rt]
i	May be central		Tortoise [to:təs] – [to:rtoiz]
e
ǽ
o
ə
ei
ai
oi
au			[au] changes into [u:] e.g. house [haus] – [hu:s]
ou
iə			[iə] does`t occur since Scottish English is rhotic, it preserves post – vocalic [r] e.g. beer [biə] – [bir], realize [riəlaiz] - [ri۸lais]
εə			[εə] doesn`t occur since Scottish English is rhotic, it preserves post – vocalic [r]
uə			[uə] does`t occur since Scottish English is rhotic, it preserves post – vocalic [r] e.g. moor [muə] – [mur]
oə
əu			In thought [∂əu] – [Өo:]
۸	May be central

Scottish English vs. RP (vowels)