Why do things smell different?
Show answer & explanation
Answer: Unique molecules fit receptors
Air carries different weights — Wrong. While molecules have different weights, smell detection works through shape recognition, not weight.
Unique molecules fit receptors ✓ — Correct! Every substance releases unique molecules. Your nose has hundreds of receptor types, each fitting different molecule shapes like keys in locks. Your brain interprets the combination as a specific smell—that's why you recognize thousands of odors!
Temperature changes smells — Wrong. Temperature affects how fast molecules evaporate, but the unique smell comes from molecular shape.
Go deeper: Olfactory receptor
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