Their shapes stay the same in any container. Their shapes change when they are in different containers. Their volumes stay the same in any container. Their volumes change when they are in different containers.
I gave my students this multiple choice question: Which statement correctly describes both gases and liquids?

Only one answer is correct among these 4 choices:
- Their shapes stay the same in any container.
- Their shapes change when they are in different containers.
- Their volumes stay the same in any container.
- Their volumes change when they are in different containers.

Could you tell me which one is correct?

Their shapes change when they are in different containers.