A mecury barometer
A fortin barometer
A mecury manometer
An aneroid barometer
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Here we go!!!
Mercury manometer, mercury barometer, Fortin barometer basically mean the same thing. Just that fortin barometer has vernier scale.
They all use liquid..
An altimeter is used to measure altitude. It does not use any liquid.
Similarly, and aneriod barometer is used to measure air pressure. It doesn't also use liquid.
So D is probably correct

This is capitally wrong,,,,,both fortins and aneroid barometer are used to perform thesame functiom,,,,
note but when fortin barometer is used for determining d height of a point or an object above d ground it name changes from fortin to altimeter,,,,sotherefore d ansa is fortin (B)

