Which of the following best describes evaporation?

The correct answer is It is a process where particles escape from the surface of a liquid..

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: Which of the following best describes evaporation. The correct response is It is a process where particles escape from the surface of a liquid., 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 210 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.