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发表于 2010-9-11 06:19 AM
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本帖最后由 牛二买刀 于 2010-9-11 08:25 编辑
航空油的物理特性:
http://en.wikipedia.org/wiki/Jet_fuel
Typical Physical Properties for Jet A and Jet A-1
Jet A-1 Fuel must meet the specification for DEF STAN 91-91 (Jet A-1), ASTM specification D1655 (Jet A-1) and IATA Guidance Material (Kerosine Type), NATO Code F-35.
Jet A Fuel must reach ASTM specification D1655 (Jet A) [4]
Jet A-1 Jet A
Flash point: > 38 °C (100.4 °F)
Autoignition temperature: 210 °C (410 °F)
Freezing point: < −47 °C (−52.6 °F) < −40 °C (−40 °F)
Open air burning temperatures: 287.5 °C (549.5 °F)
Density at 15 °C (59 °F): 0.775 kg/L - 0.840 kg/L
Specific energy >42.80 MJ/kg
钢的熔点:
http://en.wikipedia.org/wiki/Structural_steel
Thermal properties
The properties of steel vary widely, depending on its alloying elements.
The austenizing temperature, the temperature where a steel transforms to an austenite crystal structure, for steel starts at 900°C for pure iron, then, as more carbon is added, the temperature falls to a minimum 724°C for eutectic steel (steel with only .83% by weight of carbon in it). As 2.1% carbon (by mass) is approached, the austenizing temperature climbs back up, to 1130°C. Similarly, the melting point of steel changes based on the alloy.
The lowest temperature at which a plain carbon steel can begin to melt, its solidus, is 1130 °C. Steel never turns into a liquid below this temperature. Pure Iron ('Steel' with 0% Carbon) starts to melt at 1492 °C (2720 °F), and is completely liquid upon reaching 1539 °C (2802 °F). Steel with 2.1% Carbon by weight begins melting at 1130 °C (2066 °F), and is completely molten upon reaching 1315 °C (2400 °F). 'Steel' with more than 2.1% Carbon is no longer Steel, but is known as Cast iron. http://www.msm.cam.ac.uk/phase-
世贸倒塌录像:
http://www.911research.com/wtc/e ... cloud_afterglow.mpg
AIA
http://www.aia.org/akr/Resources ... ;recspec=AIAP014796
为什么央视大楼比世贸结实?至今是个谜。
谨以此文献给九一一的冤魂。 |
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