And this will allow the molecule to escape into the space above. So that means if I somehow increase the kinetic energy of this system, evaporation will occur. And if I let them evaporate and then I open, I should hear a hissing sound. So let's try to increase the kinetic energy of this system by shaking it. If I shake this, a lot of the molecules are on the surface and within will gain enough kinetic energy, will escape into the gas phase. And if right, then I open this, I should hear the gas molecules escaping.