Etymology:
The word "altimeter" comes from the Latin words "altus," meaning "high," and "metrum," meaning "measure."
Meaning:
An altimeter is an instrument that measures altitude, which is the height of an object above a fixed reference point, typically sea level.
Origin:
The concept of an altimeter can be traced back to the early 19th century, when scientists began developing devices that could measure the height of balloons and other objects that were ascending into the atmosphere.
The first practical altimeter was invented in 1843 by the French scientist Jean-Charles Charles, who used a mercury barometer to measure changes in atmospheric pressure as a function of altitude. Subsequent developments led to the invention of more accurate and reliable altimeters, including aneroid barometers, which were used in early aircraft.
In the 20th century, altimeters based on radar technology were developed, which provided more precise measurements. Today, various types of altimeters are used in aviation, navigation, surveying, and other applications.
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