Atmospheric aerosol particles derive from human activities, including stack emissions, vehicle exhaust, and pesticides, and the natural environment, such as sea spray, dust, and forest fires. These particles undergo a series of complex reactions and eventually form cloud condensation nuclei (CCN), which interact with water molecules in the atmosphere and significantly impact both climate and human health. For instance, CCN concentration impacts cloud structure, which influences Earth's energy balance through albedo, lifetime modulation, and precipitation, playing a crucial role in climate regulation. Additionally, the interaction of respiratory microdroplets carrying pathogens with water vapor impacts respiratory disease transmission. Understanding the interaction of aerosol particles with water vapor is therefore vital to establish accurate models for precipitation, climate change, and aerosol disease transmission. Hygroscopicity refers to the ability of an aerosol particle to uptake water vapor from air and determines the resulting aerosol particle size as a function of the relative humidity (RH). Many hygroscopic compounds, such as sodium chloride (NaCl) or ammonium sulfate, have a characteristic RH at which they convert from a solid to a liquid drop, termed the deliquescence point. Aerosol particle deliquescence point is typically determined by measuring the ensemble averaged mass growth factor (wet mass/dry mass) as a function of RH. This measurement shows no water uptake below the deliquescence RH and then a discrete jump in mass growth factor upon deliquescence. These prior works suggest that deliquescence occurs instantaneously at a given RH and have informed the prevailing assumption of instantaneous aerosol particle dissolution at the deliquescence RH in current aerosol models. However, some recent works have shown that water condenses on NaCl particles prior to the macroscopic deliquescence point and have measured finite dissolution rates prior to deliquescence. Aerosol salts are generally nonspherical in shape, which is expected to influence the dynamics of water adsorption and particle dissolution in a way that cannot be captured by bulk analysis techniques. The dissolution mechanisms of hygroscopic aerosol particles and the related water condensation dynamics remain obscure due to the lack of single particle measurements.