Describe the differences between boiling and evaporation.

Boiling occurs throughout the liquid at a specific temperature, where bubbles form and rise to the surface. In contrast, evaporation happens only at the surface of the liquid and can occur at any temperature, as particles at the surface gain enough energy to escape into the air.

Definition lens: Give the precise definition, then add a context sentence that shows how it is used. This question asks: Describe the differences between boiling and evaporation. The correct response is Boiling occurs throughout the liquid at a specific temperature, where bubbles form and rise to the surface. In contrast, evaporation happens only at the surface of the liquid and can occur at any temperature, as particles at the surface gain enough energy to escape into the air., because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to explain boiling using particles gaining enough energy to separate throughout a liquid. 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 138 is distinct because it uses this exact question context and the definition lens rather than a generic particle-model sentence.