If I take the same container of liquid and I spill it into the room, what will happen? Well, they won't escape. They will just create a small puddle and they will stay there, right? That's because they do experience intermolecular attractions and they don't have high velocities or high translational speeds. And that means these intermolecular attractions and low velocities will keep the molecules together. Now, of course, some of these guys will have enough kinetic energy to escape this environment, but that's a different idea.