The phonetic transcription of "wert in mid air" is /wɜːt ɪn mɪd ɛər/. The word "wert" is an archaic form of "were" which means "was" or "were". It is derived from the Old English word "weorðan". In standard modern English, "were" is the correct form to use instead of "wert". "Mid air" means suspended in the air, which is a phrase commonly used in sports or aviation. Correct spelling is important to ensure effective communication and avoid confusion.