Hydrophilic molecules in the mobile phase will tend to elute first.

That is, lighter molecules tend to boil off in larger quantities at the processing temperatures.

If the partition is then removed, the molecules will tend to spread out and occupy both halves of the box.

So molecules will tend to configure themselves in a way that minimizes their energy.

Viscosity is a property of water and other liquids where the molecules tend to stick together.

In addition, the smallest molecules tend to evaporate easily, which also adds to air pollution, so the new gas will have fewer of those.

When a magnetic field is applied, the molecules will tend to align with or against the field.

If the interaction is strong then the molecules tend to merge or blend with each other.

If the molecules do not tend to stick to each other particularly strongly, then they will tend to fly apart.

On the other hand, stiff or rigid molecules tend to fit well or not at all.