Manometer

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Pressure gauges (or manometers) are often similar to this one

A manometer is a device that is able to measure the pressure of a medium (a liquid, or a gas). In most cases, the relative pressure will be measured. A barometer can measure the absolute pressure, compared to a vacuum. There are different designs, for different applications.

The name ("manometer") comes from Ancient Greek, μανός manós -thin and μέτρον métron measurement, or ruler.

Many animals have a tympanic membrane (or eardrum), which only reacts to changes in pressure.