An ordinary aircraft altimeter uses a type of Aneroid Barometer which measures the changes in air pressure at different heights.
(An ordinary aircraft altimeter; uses; a type of Aneroid Barometer) (Aneroid Barometer; measures; the changes in air pressure at different heights)
An ordinary aircraft altimeter Aneroid Barometer
uses measures
a type of Aneroid Barometer
the changes in air pressure at different heights