Aerosols created by electronic cigarettes are suspensions of liquid droplets in a gas phase. All of the volatile or semi-volatile compounds in the system will partition between both phases; among these compounds are the "e-liquid" constituents plus the degradation products such as formaldehyde produced during "vaping". This partitioning affects deposition in the respiratory tract and optimal analytical method design. Theory can be used to predict the particle- vs. gas-phase distribution of each compound as a function of the composition of the aerosol droplets, temperature, and the vapor pressure of the compound. As an example, even at the highest total particulate matter (TPM, μg/m3) levels for e-cigarette aerosols, formaldehyde as CH2O will be mostly in the gas phase; two important adducts of formaldehyde will be mostly in the aerosol droplets even at the lowest TPM levels.

中文翻译：

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计算电子烟中丙二醇和甘油气溶胶中化合物依赖的气滴分布

电子烟产生的气溶胶是气相中的液滴悬浮液。系统中的所有挥发性或半挥发性化合物都会在两相之间分配；在这些化合物中，有“电子烟油”成分加上“电子烟”过程中产生的甲醛等降解产物。这种分配会影响呼吸道中的沉积和最佳分析方法设计。理论可用于预测每种化合物的颗粒与气相分布，作为气溶胶液滴组成、温度和化合物蒸气压的函数。例如，即使在电子烟气溶胶的最高总颗粒物（TPM，μg/m3）水平下，甲醛作为 CH2O 也将主要处于气相；