Is salad dressing a pure substance?

* Multiple Components: Salad dressing is a mixture of various ingredients like oil, vinegar, herbs, spices, and sometimes even egg yolks or dairy.

* Variable Composition: The proportions of these ingredients can vary greatly depending on the specific type of dressing.

* Heterogeneous: Salad dressing often has distinct phases, such as oil separating from the vinegar. This means the components aren't evenly distributed throughout the dressing.

Pure substances are single, uniform substances like water, salt, or sugar. They have a fixed composition and consistent properties throughout. Salad dressing, with its multiple ingredients and variability, does not meet this definition.