According to Lowens et al. [9], 20°C temperature and a relative humidity of 65% induce relatively higher transmission, whereas no transmission occurs at 80% relative humidity.
In particular, verdigris yields relatively mobile copper ions that can cause a higher risk of degradation depending on the relative humidity of the storage conditions.
The subsident (sinking) air is relatively dry because, as it descends, the temperature increases but the absolute humidity remains constant, which lowers the relative humidity of the air mass.
Gypsum (CaSO4) is a hardly soluble salt while other sulfates shows different levels of solubility, e.g. for Na2SO4, the solubility depends on temperature and relatively humidity [26 28].
The temperature and relatively humidity averaged 10.1 ± 1.4°C and 80.9 ± 10.1%, respectively.
Water mediated radical formation may be the main agent for change in these materials, and therefore parchment stored at a relatively low relative humidity (RH) may be afforded some protection from the main mechanism of protein change.
According to them, this variation is due to the increase of condensation mass flux with respect to the relative humidity for droplets of relatively small radii.
While for all of China the contribution of sunshine duration remained relatively stable, the importance of relative humidity increased considerably during the last two decades, particularly in winter.
A contour diagram of constant Hausner ratio on coordinates of particle size and relative humidity allows the prediction of critical process relative humidities and zones of relatively stable process operation.
