What information does the altimeter provide to pilots?

The altimeter is an essential instrument in an aircraft that provides pilots with the altitude above sea level. It measures the atmospheric pressure outside the aircraft and converts that measurement into an altitude reading based on the standard atmospheric pressure at sea level. This information allows pilots to maintain safe flight levels, comply with air traffic control instructions, and avoid terrain and obstacles.

The altitude reading is crucial for various flight operations, including navigation, approach and landing procedures, and ensuring separation from other aircraft. By knowing their altitude, pilots can make informed decisions about their flight path and maintain situational awareness in relation to the terrain and airspace. Understanding this function of the altimeter is fundamental for instrument flying and safety in aviation.