| 单词 | diffusion |
| 释义 | diffusion (once / 2817 pages) n Diffusion is the act of dispersing something, spreading it out from a central point. When an idea catches on, that's a type of diffusion. When you spray air freshener and the scent spreads from a tight space to fill a larger one, that's diffusion. In science, diffusion is a physical process of atoms or molecules moving apart within a gas or liquid. You can also use diffusion to describe the spreading of information. Ever notice how a trendy word or band will suddenly be everywhere, even though nobody heard of it last week? That's diffusion. This word means something similar to dispersal and dissemination. WORD FAMILYdiffusion: diffusions+/diffuse: diffused, diffusely, diffuseness, diffuser, diffuses, diffusing, diffusion, diffusive, diffusor/diffused: diffusedly/diffuser: diffusers/diffusive: diffusively/diffusor: diffusors USAGE EXAMPLES“Additives that would change wine viscosity without changing the taste might be used. These results pave the way towards fine tuning of champagne aroma diffusion.” The Guardian(Dec 23, 2016) Costa has spent years learning to coax such stories out of tiny volcanic crystals with a technique he helped develop, known as diffusion chronometry. Science Magazine(Nov 17, 2016) The diffusion of Muruganantham’s innovation across parts of India and elsewhere has earned him global attention as an agent of social change. New York Times(Nov 10, 2016) 1n the act of dispersing or diffusing something the diffusion of knowledge Syn|Hypo|Hyper dispersal, dispersion, dissemination crop-dusting, spraying the dispersion of fungicides or insecticides or fertilizer on growing crops (often from a low-flying aircraft) spread, spreading act of extending over a wider scope or expanse of space or time 2n the property of being diffused or dispersed Syn|Hyper dissemination dispersion, distribution the spatial or geographic property of being scattered about over a range, area, or volume 3n the spread of social institutions (and myths and skills) from one society to another Hyper spread, spreading process or result of distributing or extending over a wide expanse of space 4n (physics) the process in which there is movement of a substance from an area of high concentration of that substance to an area of lower concentration Hypo|Hyper osmosis (biology, chemistry) diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal permeation, pervasion, suffusionthe process of permeating or infusing something with a substance transportan exchange of molecules (and their kinetic energy and momentum) across the boundary between adjacent layers of a fluid or across cell membranes active transporttransport of a substance (as a protein or drug) across a cell membrane against the concentration gradient; requires an expenditure of energy ammonificationimpregnation with ammonia or a compound of ammonia carbonationsaturation with carbon dioxide (as soda water) impregnation, saturationthe process of totally saturating something with a substance reverse osmosis(chemistry) a method of producing pure water; a solvent passes through a semipermeable membrane in a direction opposite to that for natural osmosis when it is subjected to a hydrostatic pressure greater than the osmotic pressure passive transporttransport of a substance across a cell membrane by diffusion; expenditure of energy is not required action, activity, natural action, natural process a process existing in or produced by nature (rather than by the intent of human beings) |
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