Final answer:
If the cap is not tightened enough on the wash bottle, the expanding vinegar can cause the bottle to break. Tightly constricting the expanding gas is equivalent to compressing it, and both liquids and solids resist being compressed with large forces. To avoid rupturing containers, they have air gaps to allow for expansion and contraction.
Step-by-step explanation:
When a glass bottle full of vinegar warms up, both the vinegar and the glass expand, but vinegar expands significantly more with temperature than glass.
If the cap is not tightened enough on the wash bottle, the expanding vinegar can cause the bottle to break.
Tightly constricting the expanding gas is equivalent to compressing it, and both liquids and solids resist being compressed with large forces.
To avoid rupturing rigid containers, they have air gaps that allow for expansion and contraction without stressing them.