Which leak testing method utilizes a vacuum?

The method that utilizes a vacuum for leak testing is vacuum testing. This approach is specifically designed to identify leaks in a vessel or system by creating a vacuum environment. When the pressure inside the test subject is lowered, any leaks will cause the pressure to rise as outside air infiltrates the system, making it possible to detect faults in the seals or material.

Vacuum testing is particularly useful for testing components that need to maintain a low-pressure environment or for applications where traditional pressure methods might not be suitable. The precision of this method allows for the detection of even small leaks that other methods might miss.

Other methods like the bubble test and hydrostatic testing rely on different principles, such as observing the formation of bubbles or using fluid pressure, and dye tracer testing involves a dye that is introduced to identify leaks based on visible coloration. These techniques do not involve a vacuum and thus serve different purposes in the context of detecting leaks.