The viscosity and the phase behavior, i.e. the number and types of phases present in a particle, are properties of BBOA that are expected to impact several climate-relevant processes. For example, phase separation and a high viscosity are properties that could lead to kinetic limitations on heterogeneous reactions , which could dictate the lifetime of BrC in BBOA and its warming effect on the climate . A low surface tension organic phase at the exterior of a particle with an aqueous-core can increase the particle's ability to act as a cloud condensation nucleus, thus affecting cloud formation and precipitation . In addition, some studies have suggested that particles in a glassy state (viscosity > 10 12 Pa s) could possibly act as heterogenous nuclei for the formation of ice clouds , thereby influencing the climate.