Automation System
An aneroid barometer

can be used to measure gas or liquid flow rates
can measure only atmospheric pressure
None of these
is very unreliable
measures pressure by sensing deflection of an evacuated chambers.

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Automation System
Pressure sensors:

use an aneroid chamber with a variable resistance output
All of these
None of these
use the piezoresistive effect in strain gauge sensors
use capacitive variations to sense pressure

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