Final answer:
A closed-end manometer is a device used to measure the pressure of a gas trapped in a container.
Step-by-step explanation:
A closed-end manometer is a device used to measure the pressure of a gas trapped in a container. It consists of a U-shaped tube with one closed arm, one arm connected to the gas, and a nonvolatile liquid, usually mercury, in between. The pressure of the gas can be determined by measuring the difference in height of the liquid levels in the two arms of the tube.