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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Emerald ash borer (EAB) is a highly invasive, non-native insect that attacks and kills all species of North American ash trees, including white, green and black ash.ased on this and the impending threat of EAB, planting ash trees is not recommended. A number of other trees grow well in Nebraska. For recommendations about trees that would do well in your area, visit ReTree Nebraska at retreenebraska. org or contact your local NFS District Forester (nfs.unl.edu).