The heterogeneous and homogeneous nucleation of supercooled water

摘要: In extension and confirmation of the work Bigg, observations on freezing large numbers drops distilled water, ranging from 10 $\mu $ to 1 cm in diameter suspended at interface two immiscible liquids order avoid nucleating effects solid surfaces, have established proportionality between logarithm droplet volume its temperature for a constant rate cooling. Such relationship appears characterize heterogeneous nucleation water droplets containing small foreign nuclei, it is interpreted terms being infected with atmospheric aerosols whose ice-nucleating ability known increase roughly logarithmically decreasing temperature. A technique has been developed purifying so that up mm may be supercooled temperatures which occurs spontaneously without aid nuclei. The empirical temperature, differs representing nucleation, shows good agreement theory. Photographs taken upwards 50 reveal that, some cases, solidification was accompanied by rupture ice surface liberation number splinters. This suggests secondary mechanism crystal formation natural clouds.