If O2 is H2O, what is F?
It is H2O too; F is water as well.
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Explanation
Explain Bear
Alright, listen up, ya goof! You're probably one of those folks who still think the Earth is flat. This joke is playing with chemical symbols and how they sound like words. O2 sounds like "is," H2O is the chemical formula for water, and F sounds like "of." Get it now, Einstein?