What does desorption mean?
Desorption is the process by which a substance that had been held on a surface, or taken up inside a material, is released from it. It is essentially the reverse of adsorption, in which molecules adhere to a surface, and it plays a crucial role in fields ranging from catalysis and chromatography to air purification and hydrogen fuel storage. Scientists deliberately induce desorption by raising temperature, reducing pressure, or flushing with a carrier gas, since controlling when molecules let go of a surface is often as important as controlling when they attach. The term appears almost exclusively in scientific writing, where phrases such as "thermal desorption" and "rate of desorption" are common. Though unfamiliar to most readers, desorption underlies familiar phenomena — odours fading from fabrics, filters being regenerated, gases escaping porous solids — making it a quietly essential word for understanding how matter interacts with surfaces.
nounThe process by which a substance that has been adsorbed onto a surface, or absorbed into a material, is released from it. It is the reverse of adsorption and is central to surface science, chromatography, and materials chemistry.
- The release of an adsorbed substance from a surface.
- The release of a previously absorbed substance from within a solid or liquid bulk phase.
"Heating the catalyst triggered the rapid desorption of hydrogen from its surface."
"Temperature-programmed desorption revealed three distinct binding states of oxygen on the metal surface."
"During regeneration, the solvent's thermal desorption restored the filter to full capacity."
Rarely pluralized; typically treated as an uncountable mass noun in scientific contexts.
"Two distinct desorptions appeared in the spectrum, corresponding to weakly and strongly bound species."
Desorption is why your deodorant works and why gas masks eventually fail — everything that sticks to a surface can be coaxed back off.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of desorption
Desorption derives from the Latin verb sorbere, meaning to suck in or swallow up, combined with the prefix de-, indicating reversal. It was coined alongside related terms such as adsorption and absorption in the vocabulary of modern physical chemistry, emerging in scientific usage in the late nineteenth century. Its sibling words — absorb, resorb, sorbent — share the same Latin root, which also gave English sorb via French.
Related word forms
How desorption is actually used
A technical term used chiefly in chemistry, physics, and environmental engineering; rare in everyday speech. In British English the first vowel is often pronounced as a long 'ee', whereas American English typically uses a reduced schwa.
Easily confused with desorption
Absorption is the uptake or incorporation of one substance into another, while desorption is the release of a substance back out of a surface or bulk phase.
Adsorption is the adhesion of molecules onto a surface — the very process desorption reverses.