Question

Q. What is the reason for leaving the gap
in the bottle ?
Cool drink bottle​

Answer 1

Answer:

So that we can drink water or cold drinks easily .

It does not fall quickly.

Hopeing this will be helpful .

Answer 2

Answer:

Soft drink bottles are filled leaving some space between the lid / cap and the liquid level. The reason is that the soft drinks are cooled below room temperature. Some times they are kept in hot Sun and weathers.