The discussion focuses on the properties of hygroscopic salts, particularly lithium chloride, and their ability to absorb moisture for calibrating humidity sensors. The equilibrium moisture content (EMC) is highlighted as a key factor, which varies with environmental conditions like temperature. The user seeks to determine appropriate container sizes for several salts to prevent overflow during absorption, emphasizing the need for a balance between container size and cost. Concerns are raised about the necessity of pre-hydrating lithium chloride for calibration, with clarification needed on its use as a desiccant versus a calibration standard. The conversation concludes with the acknowledgment that periodic recalibration of sensors may be necessary to maintain accuracy over time.