## 7 Results  
The participants of this experiment were students from three classes of the final year in a high school. After a preliminary test, we chose 30 (12 females and 18 males) learners who had the equivalent basic knowledge level required to participate in the experiment. Afterwards, the selected learners were separated randomly into two independent groups (15 learners in each group). For the experimental group, learners used the learning system based on IoT and VR, while the control group took only a theoretical course. Table 2 shows the results obtained after a post-test. The post-test consisted of 10 questions divided into two types of questions: true or false (four questions) and multiple choice questions (six questions). The results of the experimental group were significantly better than the results achieved by the learners who had only the theoretical course. The scores obtained by students varied in an interval between zero and 20. Good results were when the obtained score was greater than or equal to 10/20, and bad results were when the obtained score was strictly lower than 10/20. Finally, to get some feedback from learners who participated in this experiment (experimental group), we asked them to fill in a questionnaire about several sides of the proposed system. The questionnaire contained eight questions. The results are shown in Table 3.  
Analyzing the learners' responses to the questionnaire, the results were very encouraging regarding different aspects of the learners' interaction with the system. In fact, the survey showed that all learners (100% of responders) found the proposed educational space fun to use. In addition, 86.66% strongly agreed that performing the virtual practical activity made them feel more independent. Furthermore, 80% of learners strongly agreed that the design of the 3D components seemed realistic, allowing them to feel closely connected to reality. Only 6.66% of learners surveyed kept their responses neutral. When asked if they would be willing to participate in similar experiments in the future, 100% of learners expressed their approval. To the statement \"It helped me understand the environment\", 93.66% of learners surveyed reported that they strongly agreed, and only 6.66% abstained. In addition, 86.66% and 6.66% of learners strongly agreed and agreed, respectively, that they felt comfortable during the experiment, while only 6.66% of the learners were indifferent. As the questionnaire responses had unanimously shown, this virtual practical activity is a new, intriguing concept for learners; therefore, the vast majority of our sample exhibited a high degree of motivation for such exciting, educational experiments, affirming their desire to perform them autonomously if given the opportunity in the future. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Number of Learners** & **Good Results (Score \(\geq\) 10/20)** & **Bad Results (Score \(<\) 10/20)** \\ \hline
15 learners (control group) & 8 learners (53.33\%) & 7 learners (46.67\%) \\
15 learners (experimental group) & 14 learners (93.33\%) & 1 learner (6.66\%) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Post-test results for both groups (control and experimental). \begin{table}
\begin{tabular}{l c c c c} \hline \hline
**Questions** & **Strongly Agree** & **Agree** & **Neutral** & **Do Not Agree** \\ \hline
1. It makes me feel more independent & 86.66\% & 13.33\% & 0.0\% & 0.0\% \\
2. It is fun to use & 100\% & 0.0\% & 0.0\% & 0.0\% \\
3. Does the environment seem so realistic? & 80\% & 13.33\% & 6.66\% & 0.0\% \\
4. I will participate in similar experiments? & 100\% & 0.0\% & 0.0\% & 0.0\% \\
5. It helped me understand the experiment & 93.66\% & 0.0\% & 6.66\% & 0.0\% \\
6. I feel comfortable during the experiment & 86.66\% & 6.66\% & 6.66\% & 0.0\% \\
7. I was very motivated during the experiment & 93.66\% & 6.66\% & 0.0\% & 0.0\% \\
8. I can re-use it every time without any help & 86.66\% & 13.33\% & 0.0\% & 0.0\% \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Results of the questionnaire.