Where 𝐼𝐼 𝑢𝑢 (𝑇𝑇) is the number of droplets in an experiment that are unfrozen at temperature T, 𝐼𝐼 0 is the total number of droplets in an experiment, and V is the volume of an individual droplet. The factor of 2 was included because the 1 μL drops of the INS suspensions were each diluted with an additional 1μL of KNO3.