Which of the following best describes evaporation?

The correct answer is A change where particles escape from the surface of a liquid..

Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: Which of the following best describes evaporation. The correct response is A change where particles escape from the surface of a liquid., because gas pressure comes from particle collisions with container walls. In Changes of state, the marking point should connect directly to use the particle model to explain why gases are less dense than solids or liquids. 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 203 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.