分子蒸発速度に関する一観察

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The author measured the evaporation rate of D. B. S., D. B. P. and D. E. P. in a pot still under high vacuum (8.0 ×10-41.9 × 10-3 torr). The results are shown in Fig. 3. Uyeha has stated that the phenomena of molecular evaporation under high vacuum consist of the molecular-projective-evaporation and the molecular-burst-evaporation. The curves in Fig. 3 supported the Uyehas statement. In the molecular-burst-evaporation, the ratio (K) of the observed evaporation rate to the theoretical rate vs. temperature is shown in Fig. 4. The value of (K) was close agreement with the value of the ratio of evaporating area to the condenser area. The relation between molecular weight (M) and the threshold evaporation rate of the molecular-burst-evaporation (Ds) was expressed by the equation log Ds=-6.2 × 10-3 M-4.4.
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