Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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