Question

Which unit is used to measured Air pressure and
with which instrument?​

Answer 1

Answer:

A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. The atmosphere is the layers of air wrapped around the Earth.

For pressure, the SI system's basic unit is Pascal (Pa), which is N/m² (Newton per square meter, while Newton is kgm/s²). Pascal is a very small pressure unit and for example the standard atmospheric pressure is 101325 Pa absolute.

Answer 2

Unit: Millimetres of Mercury (mmgh)

instrument: Barometer