nyomásmagasság

Nyomásmagasság, also known as pressure altitude, is a term used in aviation and meteorology to describe the altitude in the standard atmosphere where the atmospheric pressure is equal to a given value. It is calculated by setting the pressure altitude to the altitude in the International Standard Atmosphere (ISA) where the pressure is equal to the actual pressure at the given location. This concept is crucial for aircraft performance calculations, as it allows pilots to determine the true altitude based on the indicated altitude and the local pressure.

The standard sea level pressure is defined as 1013.25 hectopascals (hPa) or 29.92 inches of mercury (inHg). Pressure altitude is typically measured in feet or meters. For example, if the actual pressure at a certain location is 950 hPa, the pressure altitude would be approximately 2,000 feet (610 meters) above sea level, as this is the altitude in the ISA where the pressure is 950 hPa.

Pressure altitude is important for several reasons. It helps pilots understand the aircraft's performance characteristics, as the air density decreases with altitude, affecting engine performance and lift. It also aids in navigation and flight planning, as it provides a reference for determining the true altitude and the corresponding air density. Additionally, pressure altitude is used in weather forecasting and aviation safety, as it helps in understanding the vertical distribution of air masses and the potential for turbulence or other weather-related hazards.

In summary, nyomásmagasság, or pressure altitude, is a critical concept in aviation and meteorology that describes the altitude in the standard atmosphere where the atmospheric pressure is equal to a given value. It is calculated based on the actual pressure at a location and is used for aircraft performance calculations, navigation, and weather forecasting.