Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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