Effect of Temperature on Density MET

Density is inversely proportional to temperature: if you think about warm air, it rises because it is less dense. So a parcel of air that is warmer than ISAISA —International Standard Atmosphere (ie ISAISA —International Standard Atmosphere deviation positive) will by definition be less dense than the air in ISAISA —International Standard Atmosphere. Conversely, if it is cooler than ISAISA —International Standard Atmosphere (ISAISA —International Standard Atmosphere deviation negative) then the air will be more dense than ISAISA —International Standard Atmosphere.

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If the OATOAT —Outside Air Temperature is -36°C at FL175, what can be said about the density of the air at this level?