1.2.5 Mean free path
The mean free path is the mean path length that a molecule traverses between two successive impacts with other molecules. It depends upon molecular diameter dm and temperature T in accordance with the following equation
Formula 1-8:
Mean free path
and is of significance for the various flow types of a gas in a vacuum.
The table [1] below shows the product l ·p for various gases at 0 °C.
Table 1.5:
Mean free paths of various gases at 0 °C
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