The material world is consistent and connected. From macro to micro, they are consistent and interlinked. From micro to macro, from macro to micro. But under the traditional scientific method, the reality is that physics doesn't care about chemistry, and chemistry doesn't care about biology. From concept to category and system, they are completely out of touch with each other. For example, physics only studies atoms and their related structures and movements, while chemistry only studies molecules and their structures and changes. As for various molecules, what is an atom? Physics doesn't ask, chemistry doesn't ask. This makes us lack an overall understanding of ourselves and our living environment.

For example, we only know that most of the water on the earth is composed of hydrogen and oxygen. But what are the atoms of hydrogen molecules and their smaller particles? What are the atoms of oxygen molecules and their smaller particles? Nobody knows. It seems that hydrogen is hydrogen and oxygen is oxygen, and there is nothing more essential than them. In fact, there are more essential things in hydrogen and oxygen.

Let's look at oxygen first. Oxygen is a gas that can strongly help combustion. What elements in the atom are related to fire? As we all know, it is electrons. According to the principle of photoelectric effect, we can know that photoelectricity is the same. Light can be turned into electricity, such as photovoltaic power generation. Electricity can also be changed into light, such as electric lamp lighting. For a long time, people even regarded oxygen as a phlogiston. 1777, French chemist lavoisier pointed out that substances can only be burned in oxygen-containing air. Now, this has become common sense. This shows that the basic particles that make up oxygen are free electrons, or free electrons.

Are there free electrons in the universe or electrons in a free state? Of course it exists. The so-called free electrons, or electrons in a free state, refer to delocalized electrons. In other words, there are no bound electrons inside the atom. This kind of electron can move in matter or vacuum under the action of external electric or magnetic field, such as atoms bonding. Under normal circumstances, some valence electrons can move freely without atoms. Such electrons are called free electrons.

Ionization is a particle formed by the loss of electrons of atoms or atomic groups. This process is called ionization. The energy required or released during ionization is called ionization energy. 1887, 26-year-old Arrhenius put forward ionization theory on the basis of previous studies, and 1903 won the Nobel Prize in chemistry.

As we all know, there are only electrons, protons and neutrons in atoms, and nothing else. Of these three elements, only electrons are related to fire, while protons and neutrons have nothing to do with fire. It can also prove that oxygen is a free electron.