![]() Here, altitude AL divides BC into two parts, BL = LC. Retrieved 25 January 2006.The three medians of a triangle always meet at a point.Thus, 3 medians divide a triangle into 6 smaller triangles.Each median of a triangle divides the triangle into two smaller triangles that have equal area.Every triangle has exactly 3 medians each from one vertex.The important properties of a median are given here: JetStream, the National Weather Service Online Weather School. of Environmental Medicine Thermal and Mountain Medicine Division Technical Report. Medical Problems in High Mountain Environments. International Society for Mountain Medicine. Exosphere - Thermopause to 10,000 km /6200 miles.Thermosphere - Mesopause to 675 km / 420 miles.Mesosphere - Stratopause to 85 km /53 miles.Stratosphere - Tropopause to 50 km /31 miles.Troposphere - surface to 8000 m / 5 miles at poles – 18,000 m / 11 miles at Equator, ending at the Tropopause.The Earth's atmosphere is divided into several altitude regions: These conditions are caused by the profound hypoxia associated with travel to high altitudes. Travel to high altitudes can lead to medical problems, from the mild symptoms of acute mountain sickness to the potentially fatal high altitude pulmonary oedema (HAPE) and high altitude cerebral oedema (HACE). Mountain medicine recognizes three altitude regions: Density altitude - altitude in terms of the density of the airĪlthough the term altitude is commonly used to mean the height above sea level of a location, in Geography the term Elevation is often preferred for this usage.Pressure altitude - altitude in terms of the air pressure.Height - altitude in terms of the distance above a certain point.True altitude - altitude in terms of elevation above sea level.Absolute altitude - altitude in terms of the distance above the ground directly below it.Indicated altitude - what the altimeter says.These types of altitude can be explained more simply as various ways of measuring the altitude: On a very hot day, density altitude at an airport (especially one at a high elevation) may be so high as to preclude takeoff, particularly for helicopters or a heavily loaded aircraft. Aircraft performance depends on density altitude, which is affected by barometric pressure, humidity and temperature. Density altitude is the altitude corrected for non-ISA International Standard Atmosphere atmospheric conditions.Pressure altitude and indicated altitude are the same when the altimeter is set to 29.92" Hg or 1013.25 millibars. Pressure altitude is the elevation above a standard datum air-pressure plane (typically, 1013.25 millibars or 29.92" Hg and 15☌).In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from a specified datum this is referred to over the radio as height, where the specified datum is the airfield elevation (see QFE) Height is the elevation above a ground reference point, commonly the terrain elevation.In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from mean sea level this is referred to over the radio as altitude.(see QNH) True altitude is the elevation above Mean sea level. ![]() ![]() Also referred to feet/metres Above Ground Level (AGL). Absolute altitude is the height of the aircraft above the terrain over which it is flying.Indicated altitude is the reading on the altimeter.There are several types of aviation altitude: On the flight deck, the definitive instrument for measuring altitude is the pressure altimeter, which is an aneroid barometer with a front face indicating distance (feet or meters) instead of atmospheric pressure. When flying at a Flight Level, the altimeter is always set to standard pressure (29.92 / 1013.25). Pressure altitude divided by 100 feet is referred to as the flight level, and is used above the transition altitude (18,000 feet in the US, but may be as low as 3,000 feet in other jurisdictions) so when the altimeter reads 18,000 ft on the standard pressure setting the aircraft is said to be at "Flight level 180". With the exception of a few countries whose aviation authorities use metres (e.g. Air NavigationĪviation altitude is measured using either Mean Sea Level (MSL) or local ground level (Above Ground Level, or AGL) as the reference datum. Parties exchanging altitude information must be clear which definition is being used. "true altitude"), or implicitly through the context of the communication. In aviation, the term altitude can have several meanings, and is always qualified by either explicitly adding a modifier (e.g.
0 Comments
Leave a Reply. |