How does the particle model explain why gases are less dense than solids (Changes of state)

The correct answer is Particles in gases are far apart and have more space between them..

Cause lens: Name the cause, then state the effect on particles, pressure, density, or energy. This question asks: How does the particle model explain why gases are less dense than solids (Changes of state). The correct response is Particles in gases are far apart and have more space between them., because the particle model explains the observable property using particles. In Changes of state, the marking point should connect directly to describe limitations of simple particle model diagrams for representing real particles, forces and motion. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Changes of state and the particle model, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 208 is distinct because it uses this exact question context and the cause lens rather than a generic particle-model sentence.