The rate of diffusion is directly proportional to temperature; and The rate of diffusion is indirectly related to molecular weight (heavier particles move more slowly than lighter, smaller ones). At room temperature, the average velocity of a molecule is fast-about 2 km/sec (=3997 mph!).
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Order: Coleoptera. Family: Buprestidae. The emerald ash borer (EAB) is an invasive wood-boring beetle, native to parts of Asia. It was detected in the Detroit, Michigan and Windsor, Ontario area in 2002, but likely existed undetected in North America since the 1990's.