This video shows a set of balloon animals being placed into liquid nitrogen. The animals’ volume decreases dramatically. Then, the balloon animals are removed from the container and return to their original shape and volume. Potential driving questions include:
What conditions changed when the balloons were placed into the liquid nitrogen?
What happened to the arrangement of the particles of gas inside the balloons?
Why are the balloons able to return to their previous volume?
Alternatively, the teacher can have the students record their own questions as they watch the video clip. The class could collect and share the questions posed to determine which should be investigated.