Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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