Experiment of Artificial Snow Crystals for Science Education

人工雪晶是用一种简单的方法制造出来的，用盐和冰的混合物碾碎成果子露作为冷却材料。将冷冻混合物放入保温瓶中，充电后在上面放置一块黑色丙烯酸板作为衬底。空气中的水蒸气被困在封闭空间中，在亚克力板表面结晶。在工作距离为65毫米的立体显微镜下观察保温瓶中的晶体。在高温高湿环境下，使用紧凑的干燥箱或冰箱使保温瓶中的空气适当干燥。另一种生产人造雪晶的方法也已被开发出来，它使用的是将薄合成纤维放入含有盐和碎冰的冷冻混合物的保温瓶中。在此之前，纤维通过静电充电，然后将带电的纤维放入一个小塑料容器中，该容器放置在保温瓶中的冷冻混合物上。水蒸气由放置在保温瓶顶部的微湿纸扩散而来。几分钟后，人造雪晶出现在纤维上。研究还表明，利用蒲公英的毛发在容器中接近垂直平面延伸，可以产生对称性非常好的雪晶。证明了雪晶核的种子是在毛上带电的刺上产生的。

Artificial snow Crystals were produced by a simple method using a mixture of salt and ice crushed into sherbet as the cooling material.The freezing mixture was contained in a thermos, and a black acrylic plate was placed on it as a substrate after being charged up.The water vapor in the air trapped in the closed space was crystallized onto the surface of the acrylic plate. The crystals in the thermos were observed using a stereomicroscope with a working distance of 65 mm.For high temperature and high humidity environments, a compact dry box or refrigerator was employed to make the air in the thermos properly dry.Another method of production of artificial snow crystals have also been developed using thin synthetic fibers in a thermos containing a freezing mixture of salt and crushed ice.In advance, the fibers were charged up by static electricity and the charged fibers were put in a small plastic vessel, which was placed on a freezing mixture in the thermos.Water vapor was supplied by diffusion from slightly wetted paper placed at the top of the thermos.Several minutes later, artificial snow crystals appeared on the fibers.It was also demonstrated that snow crystals with very good symmetry are produced using dandelion hairs that extend near vertical plane in the vessel.It was proved that the seeds of nuclear of snow crystals are produced at charged up thorns on the hairs.