What instrument is used for measuring height above sea level?

What instrument is used for measuring height above sea level?

• A. Altimeter
• B. Barometer
• C. Gyrometer
• D. Thermometer

Answer: (A)

The altimeter is specifically designed to measure altitude, which is the height above sea level. It typically works by measuring changes in atmospheric pressure, as air pressure decreases with an increase in altitude. This principle enables the altimeter to calculate how high it is relative to sea level, making it essential for pilots, hikers, and scientists who need to know their elevation.

The other options have distinct functions that do not relate to measuring height above sea level. A barometer measures atmospheric pressure, a gyrometer measures angular velocity or orientation, and a thermometer measures temperature. Hence, they do not provide information about altitude in the way an altimeter does.