Hello, A project I am working on currently requires me to test how capacitors in our circuit react to change in Humidity. As expected, the experimental results suggest that capacitance goes up with increasing humidity, as the electric permitivitty of air surrounding capacitor increases. However, I also see a curious thing - there is a delay of a few minutes before capacitor responds to change in Humidity. I am conducting these experiments in a closed humidity chamber. I can tell the delay comes from the capacitor because even when chamber's relative humidity display stabilizes to a constant RH value, the capacitor still takes some sizable amount of time before it settles down. This delay is also observed in commercial humidity sensors that use capacitors. One would expect the capacitance to change immediately, as permittivity of air changed as soon as humidity changed. What causes this delay then? P.S. Btw, my capacitors are simple two plate capacitors, with no dielectric between them except air. So, any change in capacitance can be safely assumed to come only from changing properties of air.