There is no average size of a vacuum leak, it can range from microscopic to large tears, depending on what caused it. The size of a vacuum leak can be determined by measuring the leakage rate, which is the amount of process gas or air that escapes from the system per second. Most technical leaks are too small to be seen with the naked eye. Helium leak detectors, like our TAPIR, provide the most accurate method for detecting and quantifying small vacuum leaks.