Answer:
Solids expand when they are heated.
Explanation:
It is possible to loosen caps on the screw top bottles by dipping the cap briefly in hot water due to the fact that whenever a solid is heated, it expands. This means that the size of the solid Screw cap (in this our case) increases as the temperature does.
This increase in size causes it to slide off easily from the mouth of the bottle when a little twisting effort is applied.
