## 4 Result Analysis and Discussion
Regarding the test methods used, the results obtained provide several points for discussion:  
* Desiccators: Represent a simple and undemanding method that can be implemented in every laboratory without any special investment. Basically, it is possible to use \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Sample**} & \multicolumn{3}{c}{**Method**} \\ \cline{2-4}  & **Sulfuric acid Solution** & **Salt Solution** & **Environmental Chamber** & **Dynamic Vapor Sorption \({}^{*}\)** \\ \hline AC-4 & & & 27–64 \\ AC-5 & 1700 & 1854 & 1762 & 25–65 \\ AC-6 & & & 24–67 \\ \hline \hline \end{tabular} \({}^{*}\) More measurements were obtained; the length depends on the number of cycles and accuracy. Approximate ranges for one measurement cycle are given.  
\end{table} 
Table 10: Total time duration of the measurements. sulfuric acid or solutions of salts, which are currently more preferred because of safety. If the laboratory can maintain a stable room temperature, the costs of these measurements are minimal. The desiccator methods show less accuracy and greater variation in the results. It is due to the influence of the ambient temperature in the room where the desiccators are located and its changes. To eliminate these phenomena, test dishes are used that can be covered while the desiccator is open for the sample to be removed. For stability, it is possible to place the desiccators in an environmental chamber, or to use the climatic chamber directly for conditioning the samples, but this approach increases the measurements cost. * Environmental chamber: May improve the thermal stability of the environment, yet it brings other problems in terms of the accuracy of the humidity control and its stability. As indicated in the provided tests, the environmental chambers had to be regularly defrosted during the measurement process. This procedure complicates the measurement, and it requires alternating between two chambers after a few days of conditioning. The samples always needed to be transferred to the next chamber during the weighing, where conditioning continued until the first chamber was defrosted and vice versa. At low humidity levels, this approach may be suitable, but at higher relative humidity levels, it could lead to oscillations of mass because each chamber has its own deviation of humidity and temperature sensors. Environmental chambers set to a high relative humidity are prone to condensation of water vapor on the chamber walls and samples as well. Condensate can drip onto the samples and distort the effect of the sorption. We have observed these errors at the highest point of relative humidity of 95% in our chambers. Condensate droplets lead to oscillations of samples mass. Later, a small piece of PE foil was used to prevent direct dripping of condensate from the chamber ceiling onto the samples. * Operating temperature: There should be an absolutely constant temperature during the whole measurement cycle in the laboratory. In an actual, real operation, even an air-conditioned room with a set temperature of 23 \({}^{\circ}\)C will still slightly change its temperature during the year and the air conditioners also oscillate in cycle on and off. Any presence of temperature changes leads to changes in humidity followed by a change in mass. Temperature changes in the room could have influenced the scale as well. Heat-compensated scales are commonly used for weighing in laboratories. For long-term measurements, this fact may still introduce some inaccuracies in the final results. This effect can be suppressed with the use of a larger sample weight where the errors caused by the temperature compensations should be very small. However, larger samples prolong the measurement time and make it difficult to use the samples in enclosed dishes. * Time management: Both conventional methods require a long time and samples weighing in regular intervals. The measurements are very time consuming, as it can take several weeks to reach each level of moisture equilibrium.