And now all these water molecules are found inside the liquid and they can easily move about because as we said earlier, once the water molecules are deep inside our liquid beneath the surface, they can move about freely because by moving about, they're not losing any net amount of hydrogen bonds. So adding detergent molecules will cause them to align along the surface so that their polar sections point inward towards the water, as shown in this diagram. And their non polar green tails, hydrophobic tails, point towards the air. Now, the water molecules near the surface now feel much more comfortable because they can interact with the polar heads of our detergent. And this means when we apply a force onto the surface of that liquid because these water molecules feel much more comfortable they're not constrained anymore and they can move around freely. When we apply a force, they will have no problem moving around that force.