Pressure decay testing evaluates the integrity of sealed containers by measuring pressure variations over time. The container is first pressurized and then monitored to determine whether gas escapes through potential defects. If a leak is present, the pressure level decreases, indicating compromised packaging integrity. This testing method provides accurate and repeatable measurements, making it widely used in pharmaceutical manufacturing and other industries requiring secure packaging. Pressure decay testing allows manufacturers to identify leaks early, maintain consistent product quality, and ensure that packaging systems perform reliably during storage and distribution.