A chemical substance applied to surfaces to prevent them from fogging up or becoming obscured by condensation.
From anti- + fog + -ant (agent that does something). Consumer product term developed in the 20th century for eyeglass and window treatments.
Antifoggants work by making water bead up instead of forming a thin film of condensation—they use the same chemistry as water-repellent coatings that keep water off phone screens!
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