Breadcrumb Home > Dictionary > Index T thermal diffusion: Meaning and Definition of Find definitions for: ther'mal diffu'sion Pronunciation: [key] — Physical Chem. Physical Chem. the separation of constituents, often isotopes, of a fluid under the influence of a temperature gradient. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thermal conductivity thermal efficiency TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: irascible Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language