Gallium based room temperature liquid metal alloys present an exciting opportunity for research due to their attractive material properties. These alloys can readily remain liquid at room temperature and exhibit unusual phenomena at the air-liquid interface due to oxidation of the gallium. We present a phenomenological study of droplet impacts on a solid substrate measuring the spread parameter ${\xi }_{max}=D_{max}/D_0$ as function of the Weber number, and by extension, the impact velocity, as well as the spread time of the droplets. In order to characterize the surface behavior, we utilized direct measurement of surface forces using a glass probe and a tensiometer, finding the effective surface tension to be ${\sigma }_{\mathrm{eff}}=628\pm 37\mathrm{mN}/\mathrm{m}$. Finally, we developed a model of spreading that scales the spread factor ${\xi }_{max}$ with the Weber number to the power of $\frac{1}{2}$.

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• Contact line dynamics
• Drop & bubble phenomena
• Drops & bubbles
• Surface tension effects
• Thin fluid films
• Wetting
• Liquid metals