According to the causes,the surface defects can be divided into blister containing non-metallic inclusion,blister without non-metallic inclusion and “raindrop”,“gills”,“mountained”. 不含有非金属夹杂的气囊表面缺陷;由气泡产生的“雨点”状表面缺陷;“鱼鳞”状表面缺陷;“山水画”状表面缺陷。The raindrops have left spots on the windows. 雨滴在窗上留下了斑点。
mg ,又即 W ,为水滴的重量; π 为圆周率; a 为管口半径; λ 为液体的表面张力; α 为接触角度(液面与刚体接触点的延伸切线与刚体平面之间的角度)。这个关系是简单地量度表面张力的基础,常用于石油工业。
此外,由于水和空气的折射率,光线折射和反射在雨珠表面,导致彩虹的形成。
英语百科
Drop (liquid) 水滴
(重定向自Raindrop)
A drop or droplet is a small column of liquid, bounded completely or almost completely by free surfaces. A drop may form when liquid accumulates at the lower end of a tube or other surface boundary, producing a hanging drop called a pendant drop. Drops may also be formed by the condensation of a vapor or by atomization of a larger mass of liquid.