The magnitude of the energy loss during one force spectroscopy cycle in air is calculated to be 2.78 ± 0.01 pJ (Fig. ). In contrast, there is no detectable F snap for an EGaIn droplet of similar size (R = 6 µm) contacting the same C4 surface in ethanol; the adhesion is minimal with F adh = 1 nN and there is little hysteresis between the approach and retract curves with an energy loss calculated to be 1.0 ± 0.1 fJ (Fig. ). The small discrete force jumps of magnitudes δF = 1-3 nN in the approach and retract curves are likely due to the stick-slip motion of contact line; this indicates that the droplets in ethanol are slightly pinned.