What is the main difference between boiling and evaporation?

The correct answer is Boiling occurs throughout the liquid, while evaporation occurs only at the surface..

Application lens: Apply the rule to the specific sample or situation instead of reciting a broad fact. This question asks: What is the main difference between boiling and evaporation. The correct response is Boiling occurs throughout the liquid, while evaporation occurs only at the surface., because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to distinguish boiling from evaporation using where and how the change occurs. 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 163 is distinct because it uses this exact question context and the application lens rather than a generic particle-model sentence.