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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B. An Intermittent Positive Pressure Breathing (IPPB) machine assists the pupil in getting medication into the lungs and in loosening mucus so that it can be coughed up. A. Medication placed in the nebulizer cup is converted into a fine mist which is delivered to the lungs.