https://wiki.alsresume.com/index.php?action=history&feed=atom&title=Sea-Level_Standard_Atmosphere_%28SLSA%29Sea-Level Standard Atmosphere (SLSA) - Revision history2026-04-07T17:45:09ZRevision history for this page on the wikiMediaWiki 1.42.0https://wiki.alsresume.com/index.php?title=Sea-Level_Standard_Atmosphere_(SLSA)&diff=27303&oldid=prevAdmin: 1 revision imported2025-04-10T03:19:52Z<p>1 revision imported</p>
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<p><b>New page</b></p><div>== Overview ==<br />
The '''Sea-Level Standard Atmosphere (SLSA)''' is a hypothetical model representing the Earth's atmosphere at sea level, defining standard values for pressure, temperature, and density. It is not a real-time depiction but a reference used for calculations and comparisons in aviation and engineering.<br />
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== Standard Values ==<br />
* '''Temperature''': 15°C (59°F) or 288.15 K<br />
* '''Pressure''': 101,325 Pascals (1013.25 millibars or 760 mmHg)<br />
* '''Density''': 1.225 kg/m³<br />
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== Purpose ==<br />
SLSA is used for a variety of applications:<br />
* Pressure altimeter calibrations<br />
* Aircraft performance calculations<br />
* Aircraft and missile design<br />
* Ballistic tables<br />
* Aviation standards and flying rules<br />
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== Historical Context ==<br />
=== Early Development (1920s) ===<br />
The concept emerged from international agreements made in the 1920s.<br />
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=== U.S. Standard Atmosphere (1958) ===<br />
First published by the U.S. Committee on Extension to the Standard Atmosphere. It has been updated in 1962, 1966, and 1976.<br />
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=== International Standard Atmosphere (ISA) ===<br />
Developed by the International Civil Aviation Organization (ICAO), the ISA defines atmospheric properties with altitude at mid-latitudes.<br />
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=== ICAO Standard Atmosphere (1993) ===<br />
Extended the altitude coverage to 80 kilometers and formalized in ICAO Doc 7488-CD.<br />
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== Current Use ==<br />
The 1976 U.S. Standard Atmosphere and the ISA are the primary standards in aviation today.<br />
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