The "Physical World" refers to everything that exists in the universe and can be observed or measured. This includes all matter, such as rocks, water, and air, as well as energy forms like light and heat. The physical world is governed by natural laws, such as those described by physics and chemistry, which explain how objects interact and behave. In the physical world, we can study various phenomena, from the smallest particles, like atoms, to vast structures, such as galaxies. Understanding the physical world helps us make sense of our environment and develop technologies that improve our lives, such as computers and renewable energy sources.