This deviation can be important in quantitative interpretations of. Raindrop splash describes processes related to a raindrop impacting a soil surface. Miriam Marzen, Thomas Iserloh, in Precipitation, 2021. Thurai, 2010: A new understanding of raindrop shape. Processes of raindrop splash and effects on soil erosion. Finally, when the radius exceeds about 4 mm or so, the depression grows almost explosively to form a bag with an annular ring of water and then it breaks up into smaller drops. In the atmosphere, however, raindrops apparently deviate significantly from equilibrium toward more spherical shapes. The importance of shape variability of asymmetric drops is demonstrated by comparing with the traditional (or bulk) method, which uses 1-min averaged drop size distributions and equilibrium oblate shapes. With increasing size, the fall velocity increases and the pressure on the bottom increases causing the raindrop to flatten and even develop a depression. When the drop is small, surface tension wins and pulls the drop into a spherical shape. "This remarkable evolution results from a tug-of-war between two forces: the surface tension of the water and the pressure of the air pushing up against the bottom of the drop as it falls. where is the shape parameter, the slope parameter and N 0 the intercept parameter. When they get larger than a radius of about 4.5 mm they rapidly become distorted into a shape rather like a parachute with a tube of water around the base - and then they break up into smaller drops." "Small raindrops (radius < 1 millimeter (mm)) are spherical larger ones assume a shape more like that of a hamburger bun.
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