The altimeter is an instrument which measures vertical distance with respect to a reference level. The altimeter is an instrument that measures the altitude of the land surface or any object such as an airplane. Louis Paul Cailletet was the French physicist who invented the altimeter and the high-pressure manometer.
Louis Paul Cailletet (1832-1913)
French physicist and inventor who in 1877-78 was the first to liquefy oxygen, hydrogen, nitrogen, and air.
The altimeter is an instrument which measures vertical distance with respect to a reference level. The altimeter is an instrument that measures the altitude of the land surface or any object such as an airplane. Louis Paul Cailletet was the French physicist who invented the altimeter and the high-pressure manometer. 