* Mixtures are combinations of two or more substances where each substance keeps its own properties.

* Vinegar is primarily water and acetic acid.

* Oil is a type of fat.

When you combine vinegar and oil, the vinegar and oil don't chemically react to form a new substance. They remain separate and distinct. You can see this when you shake a bottle of vinegar and oil dressing – the oil will eventually separate from the vinegar again.

This type of mixture is called a heterogeneous mixture, meaning the components are not evenly distributed.