Final answer:
In a liquid, particles are closely spaced and able to slide past each other, allowing the liquid to flow and take the shape of its container while maintaining a definite volume.
Step-by-step explanation:
The arrangement of particles in a liquid is such that they are closer together than those in a gas, but with enough energy to move around each other. This intermediate level of energy allows the particles to slide past one another and rearrange, which is why liquids are able to flow and conform to the shape of their container. In this state, the attractive forces are still sufficient to keep the particles in close contact, thereby giving liquids a definite volume.