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Bellows[ edit ] A pile of pressure capsules with corrugated diaphragms in an aneroid barograph In gauges intended to sense small pressures or pressure differences, or require that an absolute pressure be measured, the gear train and needle may be driven by an enclosed and sealed bellows chamber, called an aneroid, which means "without liquid". Early barometers used a column of liquid such as water or the liquid metal mercury suspended by a vacuum. This bellows configuration is used in aneroid barometers barometers with an indicating needle and dial card , altimeters , altitude recording barographs , and the altitude telemetry instruments used in weather balloon radiosondes. These devices use the sealed chamber as a reference pressure and are driven by the external pressure. Other sensitive aircraft instruments such as air speed indicators and rate of climb indicators variometers have connections both to the internal part of the aneroid chamber and to an external enclosing chamber.
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Pirani gauge - Wikipedia

If the gas pressure is reduced the number of molecules present will fall proportionately and the wire will lose heat more slowly. Measuring the heat loss is an indirect indication of pressure. There are three possible schemes that can be done. In many systems, the wire is maintained at a constant resistance R by controlling the voltage I through the wire. The resistance can be set using a bridge circuit. The voltage required to achieve this balance is therefore a measure of the vacuum.
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