Many seemingly ordinary changes in life involve oxidation and reduction.

Such as: nail rust, wine making, flour fermentation, making steamed bread, scaling with acetic acid, etc.

It is common in industrial production, and the reflection of any substance is based on these two kinds.

However, some substances are very oxidizing and are often used as oxidants in production and life, such as fluorine (F), chlorine (CL), iodine (I) and oxygen and ozone in our air.

Reducing agents are: active metals (that is, ordinary metals except gold, silver, copper and platinum).

Everything in nature cannot grow without oxidation and reduction. In a thunderstorm, lightning can reduce nitrogen in the air and fix it into nitrogen for plants to absorb. Photosynthesis of plants reduces carbon dioxide to pentose for plant growth. Animals eat plants to oxidize ingredients into various nutrients, and animals' breathing is also an oxidation reaction. After animals die, their bodies are oxidized and decomposed by microorganisms, returned to the atmosphere, and reduced by plants again. It can be said that oxidation and reduction are everywhere in nature.