Final answer:
A closed-end manometer is used to pressurize air in a closed vessel and reveal leaks.
Step-by-step explanation:
In a closed-end manometer, air is pressurized in a closed vessel to reveal leaks. A manometer is a device used to measure the pressure of a gas. In a closed-end manometer, the difference in the heights of the two columns of liquid gives the pressure of the gas contained in the vessel.