Which of the following is an example of sublimation?

The correct answer is Dry ice turning into carbon dioxide gas.

Practical lens: Link apparatus, readings, and uncertainty to the exact measurement named in the objective. This question asks: Which of the following is an example of sublimation. The correct response is Dry ice turning into carbon dioxide gas, because gas pressure comes from particle collisions with container walls. In Changes of state, the marking point should connect directly to explain sublimation as a change directly between solid and gas. 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 158 is distinct because it uses this exact question context and the practical lens rather than a generic particle-model sentence.