And these hydrophilic polar heads shown in blue will orient and interact with the water molecules. But the hydrophobic tails, the non polar green tails will basically orient away from the water molecules and to the air. So we essentially replace our water molecules on the surface with these hydrophobic hydrophilic detergent molecules. 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.