Abstract
A study has been made of the spreading of the stains produced by low vapor pressure liquids in various types of filter paper and in printflex card. Both the rate of spreading and the distribution of the liquid in the stains have been measured. Semiempirical equations describing the data have been developed. The spreading studies have led to a theoretical stain size drop size relation for low vapor pressure liquids, which may be used for estimating the drop size distribution of a liquid spray. A short time after collection, the stain diameter, D, will be proportional to the drop diameter, d. With such liquids there is no “final stain size.” The spreading factor, D d , should be proportional to t 1 6 , where t is the time after collection. These conclusions have been verified in subsidiary experiments.
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