Explain sublimation as a change directly between solid and gas.

Explain sublimation as a change directly between solid and gas. Definition lens: Give the precise definition, then add a context sentence that shows how it is used. In Changes of state, this means gas pressure comes from particle collisions with container walls. The answer should use the approved wording from Changes of state and the particle model, include solid, gas, sublimation, and avoid drifting into another section of Particle model of matter. For revision, practise saying the exact objective aloud, then add the one calculation, particle movement, collision, graph, or practical detail that makes the statement true. A strong exam response for checkpoint 23 is specific to explain sublimation as a change directly between solid and gas and does not reuse a generic explanation from a neighbouring objective.