Figure 3From: Stability of the volume of air trapped on the abdomen of the water spider Argyroneta aquatica Plot of the hydrostatic pressure P w up to which air is trapped under a layer of hydrophobic hair on the abdomen of the spider in a stable state as function of the parameter (2 r ) based on equations ( 1). Contact angle θe = 140°. P w = ρ w ⋅g ⋅ x e) expressed in units of the length (cm) of a vertically oriented water column).Back to article page