Un "h" muet is not pronounced at all in French. For example, the "h" at the start of hôpital: we say l’hôpital (pronounced "lopital"), as if the word began with a vowel. Example:
un « h » aspiré : an aspirated "h" grammaire
Un "h" aspiré prevents elision and liaison. For example, the "h" at the start of héros: we say le héros (not l’héros: no elision), and un héros is pronounced without sounding the "n" at the end of un (no liaison). It is as if the word began with a consonant. Example:
Still having difficulties with 'H muet'
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