Evaporation

Real World Example

Imagine you're at a crowded party, trying to leave the room but everyone is blocking the door. Just like you, the molecules at the top of a liquid are trying to "escape" into the air, but only those with enough energy make it past the crowd. The connection here is that just as you need enough determination and space to break free from the crowd, only the most energetic molecules at the liquid's surface manage to break free into the gaseous state, leading to evaporation.