Here's why:

* Focus on fundamental principles: Physical science focuses on understanding the fundamental laws and principles governing the natural world. It investigates the nature of matter, energy, and their interactions.

* Basic research: Pure sciences like physical science prioritize basic research, aiming to expand knowledge and understanding without immediate practical applications in mind.

* Foundation for applied sciences: While not directly applied, the discoveries and principles of physical science form the foundation for numerous applied sciences like engineering, medicine, and technology.

Examples of physical science fields:

* Physics: Studies the fundamental building blocks of the universe, including motion, energy, and matter.

* Chemistry: Studies the composition, structure, properties, and reactions of matter.

* Astronomy: Studies celestial objects and phenomena in space.

* Geology: Studies the Earth's physical structure, composition, and processes.

It's important to note that the lines between pure and applied sciences can sometimes be blurry. For example, a physicist studying superconductivity might later see their work applied in the development of high-speed trains. However, the initial research was driven by a desire to understand fundamental principles, making it a pure science endeavor.