If H2O is water, what is H2O4?
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Waterererer.
Drinking.
The joke “If H2O is water, what is H2O4? Drinking” plays on the phonetic similarities between chemical notation and common English phrases. The setup introduces “H2O,” which is the chemical formula for water. The follow-up, “H2O4,” sounds like the question “What is H2O for?” when spoken aloud. The punchline, “Drinking,” provides a straightforward answer to this reinterpreted question, highlighting the primary use of water for humans.