In this case study, “Tatiana,” a college student, introduces psychrometry to her younger brother as she explains the physical phenomenon of dew. This everyday scenario is used to demonstrate the relationship between moisture content in the air and its various properties during an explanation of condensation, dew point, saturation, and related concepts. Students commonly have difficulty comprehending and applying the psychrometric chart, however this skill is necessary for them to acquire in order to be able to analyze moisture-air mixtures in industrial settings. This case was developed as an activity to reinforce the psychrometry lecture in a food engineering course for junior-level college students. It could also be used in other classes that teach psychrometry such as food science, agricultural engineering, grain processing, thermodynamics, architectural design, process engineering, and mass transfer analysis.