How to explain the word physics?

The word "physics" in Europe comes from the Greek word φ υ σ ι κ, which means nature. In ancient times, Europeans called physics "natural philosophy". In the broadest sense, it is the study of natural phenomena and laws. The word "physics" in Chinese and Japanese originated from Fang Yizhi's encyclopedia "Little Knowledge of Physics" in the late Ming and early Qing Dynasties. In the field of physics, study the basic elements of the universe: matter, energy, space, time and their interaction; By analyzing the basic laws and rules, we can fully understand this system. Physics is composed of the study of natural philosophy which is very similar to the classical times. It was not until19th century that physics was separated from philosophy and became an empirical science. In modern times, physics has become one of the most basic disciplines in natural science. Physical theory is usually expressed in mathematical form. The laws of physics verified by a large number of rigorous experiments are called laws of physics. However, like many other natural science theories, these laws cannot be proved, and their correctness can only be tested through repeated experiments. Physics is closely related to many other natural sciences, such as mathematics, chemistry, biology, astronomy and geology. Especially math and chemistry. Chemistry has a far-reaching relationship with some physical fields, such as quantum mechanics, thermodynamics and electromagnetism, and mathematics is the basic tool of physics, that is, physics depends on mathematics.