The phrase "leak rates" refers to the amount or speed at which a substance or information is leaking or being released through a hole or opening. It refers to the measure of how much of a substance is escaping or being lost. Full definition
Though focused on end uses of natural gas, the paper also shows how results are affected by highly uncertain leak rates from natural gas production and delivery. (sciencedaily.com)
I am surprised that a high leak rate such as this is not showing evidence on the ground. (mechanics.stackexchange.com)
With site - specific data, they found relatively low overall leak rates but were able to identify gas - operated valves as an important leakage point. (dotearth.blogs.nytimes.com)