Take an empty plastic bottle. Close the mouth of the bottle with an airtight stopper.
Push the bottle can in a bucket filled with water. What will you see?

Explanation

When we try to push the bottle further and further we will find it difficult to push deeper and deeper.
This indicates that watër exerts a force on the bottle in the upward direction. The upward force exerted by the pater, goes on increasing and the bottle is pushed deeper and deeper.