Absorption vs. adsorption

Absorption is the process by which things are absorbed.

Adsorption, on the other hand, describes the act of gas or liquid molecules adhering to a surface.

Both words are commonly misspelled as absorbtion and adsorbtion. This spelling error is usually corrected automatically by a computer’s spell check.


The spelling change comes from pronunciation over time. The voiced consonant of /b/ is grouped with the voiceless /tion/. Another example are the words describe and description.


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