Situation 2.
An approximately 40ML of water was placed in a graduated cylinder. It was then added with cooking oil up to 60ML. After a while the oil float on top of the water. Later, the tip of syringe (with its plunger pulled up) was dipped in the mixture until it reaches the water portion. Thr plunger was pushed down and the volume of the mixture was again recorded as shown in table 2.
Trial volume of water plus oil total volume
when air was introduced
1 60ML 87ML
2 60ML 90ML
3 60ML 91ML


What happens to the volume of water and oil mixture when air was introduced?
What does it indicate