A substance is cooled, the graph below shows how its temperature changes over time What is happening in the portion of the graph labelled \(X Y\) ?
A. The gas is cooling B. the liquid is freezing C. the gas is condensing D. the liquid is cooling
Correct Answer: C
Explanation
The correct answer is \(C\) because: - The temperature of a cooling substance will remain constant while it changes states - The flat area on the curve represents a phase change; the first phase change must be condensation while the second phase change must be freezing.
