Heat index, wet-bulb temperature and psychrometrics: what to expect in the 21st century

In recent years, the world has been facing extreme heat waves, breaking all previous records. Therefore, it is essential to emphasize teaching at least the basic knowledge of psychrometry and its impact on human health and well-being. In this paper, we explain several key concepts from the field of psychometrics as well as instructions on how to assemble a wet-bulb thermometer easily. Methods for calculating heat index, dew point, and other quantities are also mentioned, whether using a wet-bulb thermometer or modern electronic sensors.