The given statement “Water and cooking oil have the same density because they're both liquids" is false.
Answer: Option 2
Explanation:
It’s not necessary to have same densities if two elements are in the same state of matter. Just like solids, liquids also have different level of densities.
If you add some vegetable oil in water, you’ll see that oil will float upon the surface of the water. In fact, different types of oils and liquids float in water according to their densities that are different from one another.
Liquids have different densities because of the atomic structure they have and their respective particles mass which forms their density being the ratio of their mass and volume. Thus, liquids or air having heavier density float lower than those having lighter density.