Researcher paraphrase of the section's central contribution; detailed qualifications and corrections are in the related Literature Note.
Printed pp. 33–47; physical PDF 38–52.
Vapor composition, the changing liquid left in the pot, and pooled distillate composition are different quantities.
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Vapor–Liquid Equilibrium: Composition Changes During a Batch
Located in the user-supplied scan during complete reading; all page thumbnails and selected detailed figures checked. Verified describes faithful source location, not blanket factual endorsement.
Vapor composition, the changing liquid left in the pot, and pooled distillate composition are different quantities.
Locator: printed pp. 33–47; PDF 38–52.
Chapter 2 introduces heat, phase change, partial pressure and vapor–liquid equilibrium. Water, ethanol and congeners can travel together; their different distributions between phases permit enrichment. A wash near 8% ABV can initially yield much stronger vapor, while the average strength of a collected run is lower than that initial vapor. These quantities cannot be substituted for one another.
This is original paraphrase, not a direct quotation. See the linked note for critical assessment and course application.