Aneroid Barometer -

The name "aneroid" literally means "without liquid" (from the Greek a-nēros ). At its core, the device relies on mechanical physics rather than fluid dynamics: Barometer - National Geographic Education

An is a precision instrument used to measure atmospheric pressure without the use of liquids like mercury. Invented in 1844 by French scientist Lucien Vidi , it revolutionized weather monitoring by being more portable, durable, and safer than its liquid-based predecessors. How It Works aneroid barometer