41. The cloud layer that masks Saturn's thick atmosphere consists of fine particles of frozen ammonia. 42. That one involves soot, the fine particles that are part of air pollution from industrial processes. 43. At certain velocities fine particles may fly into a cyclone and separated from the flue gas. 44. Fine particles come from vehicle exhaust, power plants, factories, refineries, brush fires and even living-room fireplaces.45. What remains is very fine particles of gold. 46. The study of fine particles is called micromeritics. 47. Finer particles absorb more moisture, results in caking.48. The fine particle size means tiny spaces in between, which retard water and air movement .) 49. If so, plutonium dioxide could be released into the atmosphere and fine particles could be released. 50. The government said most face masks were ineffective against the fine particles of pollution in the air.
