Give the definition to the word "Phonetics"?

What is a monophthong?

A monophthong is a pure (unchanging) vowel sound. There are 12 monophthongs in English. They are as follows: [i:], [ɪ], [e], [æ], [ɑ:], [ɔ], [ɔ:], [u], [u:], [ʌ], [ə:], [ə]. Two of them [i:] and [u:] are diphthongised (diphthongoids).

How many monophthongs are there in English?

A monophthong is a pure (unchanging) vowel sound. There are 12 monophthongs in English. They are as follows: [i:], [ɪ], [e], [æ], [ɑ:], [ɔ], [ɔ:], [u], [u:], [ʌ], [ə:], [ə]. Two of them [i:] and [u:] are diphthongised (diphthongoids).