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Changes from the 1994 AECC definition. the term acute lung injury was abandoned. measurement of the PaO2/FIO2 ratio was changed to require a specific minimum amount of PEEP. 3 categories of ARDS were proposed (mild, moderate, and severe) based on the PaO2/FIO2 ratio. Radiographic criteria were changed to improve interrater reliability.
The Aspect Ratio of a wing is defined to be the square of the span divided by the wing area and is given the symbol AR. For a rectangular wing, this reduces to the ratio of the span to the chord length as shown at the upper right of the figure. AR = s^2 / A = s^2 / (s * c) = s / c.