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You are right in that the you the relative humidity will be quicker and easier to control. The question is whether that matter for your problem. Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air ($g/m^3$). Relative humidity is the ratio of water vapor ...

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I do not think so. Instead of looking directly at PID, lets look at Frequency domain loop shaping in general compared to State-space control (eg, Lead-Lag filters, Notch filters and PID). On top of the fact that in the current industry over 90% of all controllers are PID's or controllers I just mentioned isnt just because they are much easier to learn, but ...

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I think you've made a mistake when setting up your characteristic equation. In MATLAB I get the following for your system transfer function: for your system transfer function.

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