What does fire do?

1. Drive away wild animals and protect yourself.

2. Send signals for communication.

3, heat treatment materials (ceramics)

Step 4 hunt

5, burning weeds, producing fertilizer

6, while the iron is hot, while the iron is hot, you can't leave the fire. Usually there is a big stove beside the blacksmith, and a bellows is placed beside the stove. As soon as the bellows is pulled, the wind enters the stove, and the flame in the stove is straight. The iron to be forged is first red-hot in the furnace, and then moved to the big iron pier. The master holds the main hammer and the sledgehammer for forging.

Fire is a chemical reaction that gives off light and gives off heat. The temperature is very high and it is a way to release energy. Flame is divided into flame center, inner flame and outer flame, and the temperature rises from inside to outside in turn. Due to sufficient oxygen supply, the outer flame burns completely, with the highest temperature, while the flame core temperature is the lowest.

7. Train

The earliest train was a steam locomotive. At that time, coal or firewood was used as fuel and electricity was generated by fire, so it was called a train.

Extended data:

hominid

Controlling fire to provide heat and light is one of the great achievements of early humans. Early humans obtained kindling from natural fire sources. Later, I learned how to make a fire by drilling wood or knocking flint. Learning to use fire enables human beings to migrate to colder climates. Fire is used for cooking difficult food, lighting, heating, driving away wild animals, heat-treating materials and so on.

Archaeological research shows that/kloc-0.0 million years ago, people could use fire in a controlled way. Humans in the Near East were able to make their own fires 790,000 years ago. But the technology of using fire was not popularized until about 400 thousand years ago.

Fire also represents passion and justice, and it is a beautiful spirit.

Baidu encyclopedia-fire