What is sublimation, and can you provide an example of a substance that undergoes this process?

Sublimation is the process in which a solid changes directly into a gas without passing through the liquid state. An example of a substance that undergoes sublimation is dry ice (solid carbon dioxide), which turns into carbon dioxide gas at room temperature.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: What is sublimation, and can you provide an example of a substance that undergoes this process. The correct response is Sublimation is the process in which a solid changes directly into a gas without passing through the liquid state. An example of a substance that undergoes sublimation is dry ice (solid carbon dioxide), which turns into carbon dioxide gas at room temperature., 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 159 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.