where w is the droplet contact size on the cantilever, H and v are the droplet's height and volume, respectively (See geometry in Fig. ). Here, we assume that the contact mechanics and the force experienced by the droplet is dominated by the surface tension of EGaIn and not by the mechanical properties of the oxide skin (Young's modulus E ∼ 1 GPa ). A justification for this approach can be found in Supporting Figure . By solving equations 2 and 3 numerically, we can deduce the droplet's geometry both in air and in ethanol (Fig. ), from the point of contact (position 1), to the maximal loading force (position 2), and just before detaching from the surface (position 3). The numerical scheme used to solve the Young-Laplace equation has been described in our previous work and summarized in Supporting Figure . The numerical results for r num can then be compared with r exp values experimentally determined by reflection light microscopy (Fig. ). See Supporting Videos S1-4 for the full numerical and microscopy results.