The bubblehead charm is an alchemy spells, because it gives underwater the caster oxygen out of the water, thus changing the property of it permanently. Else it would have turned back into water and could have killed the user.[1]

References Edit

  1. Book 2 - TFoP - Ch. 21 - The Duelling Club,
    Harry Potter correctly mentioning the Bubblehead Charm as an alchemy spell.

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