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Sir Jonathon Giubertoni discovered the difference
Carbon, whether it be soot or diamond, is an element.
I assume you're asking about density when you say "substance." Take the example of carbon. In one form, it is a black powder (think soot). In its densest form it is diamond. A teaspoon of diamond has many more carbon atoms in it than a teaspoon of soot.
Carbon is usually solid by itself under the allotropic form: diamond, soot and charcoal.
carbon. Diamond is a crystalline form of carbon with a specific atomic arrangement, making it the hardest natural material known. Soot, on the other hand, is a form of carbon that results from incomplete combustion of organic matter and appears as a fine black powder.
Soot's plural is soot.
He wisely observed that patients who developed scrotum and other skin abnormalities were those exposed to heavy concentrations of soot
soot doors is provide to clean the outside of the water tubes and to remove the soot.
The homophone for soot is suit.
Soot is typically black in color.
soot
I think soot and smog come from the air pollution.