Imagine that you were flying on a commercial airplane from Chicago to London. Midflight, you request a bottle of water and drink the entire contents of the bottle before the plane begins to descend. While still at cruising altitude, you seal the lid on the bottle and put it in the pouch in the seat in front of you. When you land, you take the bottle out to recycle it, but notice that the bottle looks different from when you sealed it. What does it look like?

Select one:
a. about to explode
b. crushed inward
c. the bottle will not look any different in this situation.

While you are travelling in a plane at a cruising altitude and you had drunk enough water and made the bottle empty,you seal the bottle with a cap. Now there is air occupied inside the bottle.

At the time of landing, the empty bottle look crushed. This is due to the air pushing the bottle from outside is greater than the air inside the bottle pushing out. Hence there will be an imbalance occur.So the bottle look crushed inward.