WordGarden.ioadsorb
C2Pronunciation
UK
- /ədˈsɔːb/physicaltransitiveverb
US
Meanings
Verb
to collect a substance on the surface of another material
Beyond the definition
Imagine tiny dust particles clinging to your window screen—that’s adsorption in action! It differs from absorption (like a sponge soaking up water): absorption goes into a material, while adsorption stays on the surface. To adsorb is for molecules to stick to the outside of something, often forming a thin layer. Think of activated charcoal in a water filter; it doesn’t soak up impurities, it adsorbs them onto its enormous surface area. This surface-sticking process is crucial in everything from air purification to catalysts that speed up chemical reactions. You might say a material “has a high capacity to adsorb” certain substances.
To adsorb means to take up particles or molecules by having them adhere to the surface of something. Adsorption is the process where atoms, ions, or molecules from a gas, liquid, or dissolved solid stick to a surface. It’s a surface phenomenon—meaning it happens on the outside, not throughout the entire volume of a material. Think of it like this: if you sprinkle glitter onto tape, the glitter doesn’t become part of the tape; it stays on the surface. That sticking is adsorption.
This differs from absorption, where a substance penetrates into the bulk of another (like a paper towel soaking up spilled milk). Adsorption relies on attractive forces between the adsorbate (the substance being adsorbed) and the adsorbent (the material doing the adsorbing). These forces can be weak van der Waals forces or stronger chemical bonds.
You'll often encounter adsorption in scientific contexts, particularly in chemistry, environmental science, and materials science. For example:
- Activated carbon: Used to adsorb toxins and pollutants from water and air.
- Catalysis: Many catalysts work by adsorbing reactants onto their surface, facilitating a chemical reaction.
- Chromatography: A separation technique that relies on different substances being adsorbed differently onto a stationary phase.
- Soil Chemistry: Adsorption of nutrients onto soil particles affects their availability to plants.
So, while absorption is about entering something, adsorption is all about sticking to it—a crucial process in many natural and industrial applications.
Examples
- 1
Air filtration
Activated charcoal can adsorb odors from the air.
- 2
Water filtration
This filter is designed to adsorb heavy metals from drinking water.
- 3
Lab experiment
In the experiment, the dye quickly adsorbed onto the surface of the clay.
- Patternadsorb onto + surface
become attached to the outside of it
See also
Similar
Shades of meaning
- chemisorb
- physisorb
Contrast
- desorb
Do not confuse
Used with (collocations)
- adsorb onto a surface
- adsorb molecules
- activated carbon adsorbs pollutants
Word family
- adsorption
- adsorbent
Explore
- surface chemistry
- sorption
Forms and spellings
1 form open this card.
Main spelling
- adsorbverb