Pfeiffer Vacuum A Passion for Perfection

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.


Figure 1.4: Mean free paths

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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