What is the main difference between boiling and evaporation in terms of where the change occurs?

Boiling occurs throughout the entire liquid when it reaches its boiling point, while evaporation occurs only at the surface of the liquid at any temperature.

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: What is the main difference between boiling and evaporation in terms of where the change occurs. The correct response is Boiling occurs throughout the entire liquid when it reaches its boiling point, while evaporation occurs only at the surface of the liquid at any temperature., 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 165 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.