Digital barometers, much like analog barometers, are used to forecast the weather using humidity, air pressure, and dew point. This answer needed a few more characters.
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Mercury
They are more portable and can be used for airplane equipment
There are two types of barometers, Mercury barometers and then Aenroid barometers.
The pressure of air.
it measure the atmosphere.
they are used all over the world
mercury
Barometers are used to measure pressure.
mercury barometers and aneroid barometers both measure air pressure.
Mercury and aneroid barometers.
No! Barometers are not related to maths. They are devices used to measure atmospheric pressure... You may not be able to use barometers for maths project. - Abid