Chemistry is considered a branch of physical science because it studies the properties and behavior of matter. Here's why:

* Matter: Chemistry is all about the composition, structure, properties, and reactions of matter.

* Physical Phenomena: Chemical reactions involve the rearrangement of atoms and molecules, which are governed by physical laws.

* Quantitative Nature: Chemistry heavily relies on measurements, calculations, and mathematical models to understand and predict chemical behavior.

While chemistry shares some overlaps with biology and other sciences, its core focus on the fundamental nature of matter firmly places it within the realm of physical science.