Soot: meaning, definitions and examples

The fine black or dark brown powder resulting from the incomplete combustion of fuel like wood or coal, mostly found in chimneys or on surfaces near a fire. Often mentioned in discussions regarding air pollution or cleaning in a household setting.

• The chimney was clogged with soot
• The old factory released clouds of soot into the air

A chemical element that can take various forms, such as graphite or diamond. When referring to residues, it is the element found in charred and burnt materials. Often used in scientific contexts, discussions about environmental impact, or when talking about molecular structures.

• We need to measure the carbon emissions from this factory
• The carbon residue in the test tube was analyzed

Unwanted or unpleasant black particles that can settle on surfaces, particularly as a result of smoke. Often has a negative connotation and is used when referring to dirt or grime in a more colloquial sense. Can also refer to inappropriate or vulgar content when used in a different context, unrelated to soot.

• The old wallpaper was covered in smut from years of cigarette smoke
• His clothes were smeared with smut after he cleaned the fireplace

The powdery residue left after the complete combustion of any substance, usually seen as gray or white. Commonly mentioned when burning wood, paper, or during volcanic activity. Suitable for discussions related to fireplaces, cooking with grills, or gardening.

• After the campfire, all that was left were ashes
• The volcanic eruption covered the town in ash

Use when referring to black powdery substance created by burning, typically associated with smoke or chimneys.

• The old chimney was full of soot.
• After the fire, there was soot covering the walls.

Best used when describing something that has turned black, often through burning or tarnishing. Can have a negative connotation.

• The edges of the paper blackened in the fire.
• Over time, the silverware began to blacken.

Use when describing a small, messy spot or streak, often from dirt, ink, or another substance. Usually suggests an accidental or careless mark.

• She had a smudge of ink on her hand.
• There was a smudge on my glasses that I couldn’t get rid of.

General term for something that has become unclean or covered in dirt. Applies to many different types of contamination.

• His clothes were dirty after working in the garden.
• Don't touch that, it's dirty.