What is a leak rate?

A leak rate is an amount of substance, which passes in a certain time through a leak. As we have seen, there are several units for quantity, so the leak rates can also be expressed in different units. The symbol for the leak rate is "q".

Normally used are:

The volume leak rate q =
The mass leak rate q =
Pa·m3/s, mbar·l/s
g/a (gram per year)