1.   An electrostatic filter lining the exhaust pipe attracts the carbon particles.

2.   Backfiring cars and trucks, for instance, spit out hot carbon particles that can start grass fires.

3.   Fire too was made of matter -- gases and carbon particles.

4.   The carbon particles contained in the exhaust of both gasoline and diesel engines absorb light, creating the dark color that gives the Brown Cloud its distinctive hue.

5.   The chemicals stick to the tiny carbon particles as water filters through the plant.

6.   This abrupt cooling technique, called quenching, changes the carbon particles in the metal into hard carbide crystals.

7.   To make the chemiresistors, Hughes first mixed commercial polymers that had been dissolved in a solvent with conductive carbon particles.

8.   The carbon particles are harmless and do not alter the taste or odor of the drink, the production company Refrige said in a written statement.

9.   The carbon particles are harmless and do not alter the taste or odor of the drink, the production company Refrige said.

10.   Carbon particles collect in a metal or ceramic filter placed in the exhaust system, which are then burned off by the hot exhaust gases, regenerating the filter.