What is the name of the instrument for measuring atmospheric pressure?

Barometer is an instrument for measuring atmospheric pressure according to Torricelli's experimental principle. There are two kinds of barometer: mercury barometer and aneroid barometer. Its purpose is to predict the change of weather, and it will be sunny when the air pressure is high; When the air pressure drops, there will be stormy weather. The height can be measured. Every time 1 2m is increased, the mercury column will decrease by about1mm, so that the height of the mountain and the height of the plane flying in the air can be measured.

Principle: the air in the box is pumped out,

When the atmospheric pressure increases,

Press the lid in a little,

When the atmospheric pressure decreases,

The elastic steel sheet pulls the cover out a little.

The change of the box cover is transmitted to the pointer through the transmission device,

Deflection pointer,

The pointer is marked with scales,

Read from the dial,

You can know the atmospheric pressure at that time.