Does coal sink or float

Answer 1

coal washing is done using the property that coal floats in water while other mineral matter sink in water.

The jig that oscillates with coal and water in it actually skims the coal from the top and drains the ash, pyrites and stones at the bottom.

Depending upon the intricacy of included minerals in the lumped mass, the matter occupies suspended positions; when broken, the coal floats and other materials sink. Hence, a coal washery has a crusher preceding the jig.

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Answer 2

Coal typically sinks in water because it is denser than water. However, some types of coal may have a higher air content or porosity, causing them to float briefly before eventually sinking.