When I cut through your plane as I am now doing, I make your plane a section which you, very rightly, call a Circle. For even a sphere – which is my proper name in my own country – if he manifest himself at all to an inhabitant of Flatland – must needs manifest himself as a Circle.
From Abbott’s Flatland
9.1a Physisorption and Chemisorption
Adsorption at the solid-gas interface is traditionally subdivided into two broad classes: chemisorption and physisorption (i.e., physical adsorption).
• As the name implies, chemisorption comes very close to the formation of chemical bonds between the adsorbent (e.g., the solid) and the adsorbate (gas). In this case electron exchange between the adsorbent ...