Hydrophobic vs Hydrophilic: What's the Difference?
Shake a bottle of oil and vinegar as hard as you like. Within a minute the oil has gathered itself back into one layer on top. Nothing pushed it there — no force field, no repulsion. And yet the separation is so reliable you can set your watch by it. Understanding why is the key to solubility, to soap, and to why proteins fold the way they do. The short answer: hydrophilic ("water-loving") substances are polar or charged, so they can hydrogen-bond or form ion-dipole attractions with water and dissolve in it. Hydrophobic ("water-fearing") substances are nonpolar, cannot form those attractions, and are squeezed out of water — not because water repels them, but because water molecules would much rather bond to each other. Quick comparison at a glance Feature Hydrophilic Hydrophobic Literal meaning Water-loving Water-fearing Molecular character Polar or ionic Nonpolar Can it hydrogen-bond with water? Yes No Behaviour in water Dissolves or mixes Separates out, ...