is another well known effect which must be accounted for in liquid optics. Pressure balance exhibited by air bubbles in liquid (Figure 4), by the meniscus liquid surface in a drinking straw (Figure 5), and in a water glass (Figure 6) are, respectively, highly pertinent. FIGURE 2 Durre-Young Equation applied to wetting and non-wetting droplets Figure 3 Hysteresis of contact angle for a 3-phase boundary
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