Experimental Investigation of Long-Term Humidity Variations in a Thermally Stabilised Chamber

The paper presents long-term measurement results concerning relative humidity in a thermally stabilised chamber. We show that the relative humidity values inside the chamber correlate with the absolute humidity of the atmospheric air. We detected the presence of 16- and 30-day periodic signals in the spectra of the difference between the relative humidity inside the thermally stabilised chamber and the orthonormal absolute humidity of the atmospheric air. We also discovered the presence of periodic signals in the periodogram of variations in relative humidity inside the thermally stabilised chamber; the periods of those signals are 1436 and 1440 minutes, which corresponds to the period of the Earth's rotation around its axis, taking into account its rotation around the Sun

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