Automation System
An aneroid barometer

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

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Automation System
Pressure sensors:

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

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