Abstract
The observation of water drop formation and evaporation in our electron microscope hydration chamber suggested that we might use it to study cloud physics and cloud-chamber physics problems. These would include growth of very small water droplets with and without heterogenous nuclei and their coalescence into larger drops like rain drops. Also, the evaporation of small drops and their freezing to form hail. The chamber can be regarded as an observable micro-atmosphere with variable supersaturation. Super saturation can be achieved by supplying the chamber with water vapor from an external water source at a higher temperature than the chamber. The hydration chamber developed in the Electron Optics Lab of R. P. M. I. has undergone one more refinement, i.e., temperature control stage designed by Dr. Hui.
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