When I stood up and looked at Nanshan, the mountains and fields were burning with fire.
The war rages on for three months, and a letter from home is worth ten thousand gold.
The purpose of fire is to burn the sacrifices, and the salt is used to cleanse the sacrifices (Exodus 30:35). Fire symbolizes sacrifice, while salt symbolizes reconciliation and balance.
In the long process of using natural fire, primitive humans continued to deepen their understanding of fire. When they reached the stage of fossil Homo sapiens, they began to make artificial fire. The earliest method of making fire was to use pyrite to rub flint, and sparks would ignite the kindling to obtain fire. In the late Paleolithic Age, with the development of drilling and grinding technology, the friction method of artificial fire was invented. ?
After people learned to make fire, they tried their best to expand the uses of fire, so that fire played a huge role in human beings' conquest of nature.
First, use fire to aid hunting. Secondly, fire can be used to process weapons and tools. For example, the tip of a wooden spear becomes hard after it is burned with fire and then cooled. Third, through the use of fire, people learned to live in any climate, and humans spread to areas where they had never lived before. Fourth, especially during the long-term use of fire, humans discovered that the clay became solid and impermeable after being roasted, and could be fired into various vessels according to people's needs. This led to the invention of pottery. The successful manufacture of pottery is the earliest meaningful application of the physical and chemical changes of a substance (clay) under the influence of fire. Fifth, the development of primitive agriculture is also closely linked to the use of fire. Agriculture at that time was very extensive, but "slash and burn" played a very important role in people's settlement?
At the end of primitive society, social material production developed further, and with the use of fire. With the improvement of capital, people began to smelt metals and use bronze. Later, with the birth of blast technology, people further invented the smelting of pig iron. Become possible. Therefore, fire effectively promoted the development of social production.
Excerpted from "Energy Interesting Views"
Salt and fire were both indispensable for sacrifices in the Old Testament era. of.
First of all, it is the need for human survival. Slash-and-burn cultivation is the most primitive use of fire.
The second is the need of human life. Making fire to cook food is the most common use of fire.
Once again, it is the need for human production, drilling wood to make fire, and the birth of industrial civilization.