Final answer:
Capsaicin in peppers creates a "hot" sensation by binding to heat receptors on the tongue, which tricks the brain into feeling a burning sensation.
Step-by-step explanation:
The sensation of tasting something "hot" when eating spicy foods like peppers containing capsaicin is not because capsaicin is corrosive or releases large quantities of heat upon ingestion. Instead, capsaicin binds to receptors on the tongue that typically respond to heat, thereby tricking the brain into sensing a hot or burning feeling even though no actual heat is present.
This chemical interaction is what leads to the characteristic and intense spiciness experienced when eating foods containing capsaicin.