Experiments show that a fraction of the incident droplet will remain on the surface after splash. Based on experimental observation, the ratio of the total mass of the secondary droplets m and the incident droplet mass M increases rapidly from zero to a value around 0.75, and then remains constant. The correlation for the mass fraction is given as

(6–89)

where . is the maximum amount of splashed mass as a fraction of the incident droplet mass. It is exposed as a tunable constant, with a default value of 0.75.