I ran an experiment, where I had to measure the relative humidity of a thermally insulated chamber containing NaCl solution. I have read from a few papers, that the relative humidity of a NaCl solution remains at 75% over a wide range of temperatures (20C to 30C).

But when I can change the temperature inside the chamber from 20C to 30C the relative humidity changes from 80% to 60%.

I am having trouble understanding what exactly is happening here. I thought it might be the pressure change caused by temperature change, so I created a small hole (needle width) to compensate for it but the result remains the same.

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