Here's a breakdown:
* Particles of matter are always in motion. This is true for solids, liquids, and gases. The hotter they are, the faster they move.
* There is space between particles of matter. This space is larger in gases, smaller in liquids, and very small in solids.
* What is between the particles depends on the state of matter.
* In gases: The space between particles is mostly empty. There are a few molecules of air (nitrogen, oxygen, etc.) scattered throughout the space.
* In liquids: The space between particles is filled with the attractive forces between the molecules. These forces keep the liquid together, but allow the molecules to move around.
* In solids: The space between particles is very small, and the particles are held in a rigid structure by strong attractive forces.
So, while it's not accurate to say the particles are moving *through* what's between them, the particles are definitely moving *within* the space between them, and the nature of that space depends on the state of matter.
Think of it this way: imagine a crowded dance floor. The people (particles) are constantly moving, but there's still space between them. They're not actually moving *through* each other, but they're definitely moving *within* the space.
