Figure 4.1: The velocity of the spreading liquid at the splashing onset usheet (open symbols) and the threshold velocity ustop (closed symbols) vs. ambient pressure for R = 3.2mm silicone oil drops of viscosity 9.4mPa s ( ), 19mPa s ( ), and 48mPa s ( ) impacting a glass slide at 3.4m s−1. While usheet decreases with pressure, ustop remains approximately constant. The threshold pressures Psheet, marked by dashed lines of the respective color, are set by the crossover of usheet (P ) and ustop.
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