Question

an hour why an is used we know h is consonents?​

Answer 1

In English, /h/ patterns as a consonant, and that's that. the actual /h/ sounds that the speaker says can be classified physiologically as voiceless vowels, because a Phonetic vowel is defined by how it's pronounced, rather than how it patterns with other sounds.

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Answer 2

h is an vovel so we add as in front

thus, we use an hour