Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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