求助，如何由饱和蒸汽压计算饱和蒸汽的ppm浓度？
RT，求助各位大佬，如何由一个物质的饱和蒸汽压（mmHg）计算其饱和蒸汽浓度(ppm)？文献原文：Since MDI has the lowest vapor pressure or vapor concentration of 0.062 ng mL1 among all the eight isocyanates tested, the detection limit of polymer P1 should be at the ppt level (i.e., 0.06 ppt) and is much lower than the permissible exposure limit (PEL) of 5 ppb. （如图）。另附文献DOI：10.1039/c3cc47934j。提前谢谢各位了~！
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