# Measurements of Room Acoustic and Thermo-Hygrometric Parameters--A Case Study +
## 1 Introduction  
The acoustic characteristics of an indoor environment can have a significant impact on a user's stress levels. Thus, the design of acoustic parameters within the indoor environment must be carefully considered and implemented in order to ensure a healthy and comfortable living space. Studies have shown that the acoustic environment can affect the stress levels of users, thus making this a vital factor in the design of indoor environments [1]. Furthermore, acoustic parameters must be designed with the aim of optimising the user's experience and ensuring a pleasant atmosphere [2]. Variation in the measurement of acoustic parameters depends on a variety of factors, including the equipment's properties, the operator's skill, the location and quantity of sources and receivers, post-processing techniques, the measuring method, thermo-hygrometric circumstances, etc. [3]. These factors are frequently regarded as measurement uncertainty. In the field of acoustics, the accuracy and assessment of experimental values are of the utmost importance. This is because the experimental values must be in line with the set regulations and standards. This is especially important in the areas of architecture and environmental science, where a precise understanding of the acoustic environment is essential. To ensure compliance with legal requirements and standards, it is necessary to ensure that experimental values and their evaluation are both correct and reliable. The accuracy of acoustic measurements has an impact on the determination of correct experimental values. In acoustic measurements, uncertainty is defined as \"a characteristic associated with a measurement result that characterises the dispersion of the result and canplausibly be assigned to the observed value\" [4]. This assertion implies that the uncertainty estimate corresponds to a close approximation of the experimental defect [3]. In other words, there are a number of factors associated with the measurement itself that contribute to uncertainty in acoustic measurements or mistakes in the experimental value. In building acoustics, several important influences affecting the determination of the correct values of acoustic parameters have been shown in the following studies: [PERSON] et al. presented uncertainty in the measurement of air and impact insulation in industrial prefabricated cross-laminated timber structures [5]. Researchers such as [PERSON] et al. [6] have determined that a link between the repeatability and reproducibility of uncertainty in building acoustic measurements is possible. In addition, [PERSON] et al. [7] discussed the assessment of flanking transmission in structures according to the EN ISO 12354-1 standard. Other significant work on the topic of uncertainty in building acoustics for the twenty-first century includes publications by [PERSON], [PERSON], [PERSON], [PERSON], and [PERSON] [8; 9; 10; 11]. The position and number of sources and receivers, the operator's skill, post-processing techniques, and measurement method-related variables are all taken into account in these papers. Still, the thermal and hygroscopic measurement conditions that arise during the measurement process have been more or less ignored. [PERSON] and [PERSON] [4] analyse the assessment of uncertainty in the noise measuring process in the context of noise management. Uncertainty in indoor acoustics has rarely been considered in the existing research papers, perhaps because, in this field, compliance with legally prescribed values is lax, and the results of experimental measurements are seen as more important. Valuable work was presented in the papers by [PERSON] et al. [12], [PERSON] et al. [13], [PERSON] et al. [14] and [PERSON] et al. [15]. They discussed uncertainty in the acoustic parameters of rooms and the uncertainty arising from changes in equipment arrangement. However, only very few have considered the importance of thermal and humidity measurement conditions in acoustic measurements.