1. Correspondence between vacuum measurement units

Figure 1 shows the corresponding units used for pressure, desorption rate and gas flow measurements.

Table 1 shows the various units of gas flow.

Let's take a 1 m ² surface area with a desorption rate of 10 ^–10 Torr · L / s · cm ² pumped by a pump with a volume flow rate q _v of 1,000 L / s.

The gas flow is :