The difference between the two: First, the strata are different, the stone salt is pure, and the salt is a mixture. Secondly, according to different uses, salt can be used as food seasoning and preservative, and it is an important chemical raw material. Salt is one of the most important substances for human survival, and it is also the most commonly used seasoning in cooking. Third, chemical molecules are different. The chemical composition of halite is sodium chloride, and the crystals are all halides of hexagonal octahedral crystals with equiaxed crystal system. The main chemical composition of salt is sodium chloride, but its structure is different from that of rock salt.

Salt can be divided into mineral salt, sea salt and table salt.

Mineral salt is salt mined from mineral salt. Because it is rich in minerals, mineral salt also has special effects, especially suitable for sensitive skin. Mineral salt and sea salt are mostly used to make bath salt. Massage the skin can not only exfoliate, but also increase blood circulation. I believe many people don't know this effect.

Salt can be divided into sea salt, well salt, mineral salt, lake salt and soil salt according to different sources. In particular, salt should be introduced, which is the most stable salt for acid-base plants. If the concentration of salt is high enough, it can play a bactericidal role. For example, some foods are salted when they are pickled, just to prevent decay. When there are homemade skin care products, adding salt to the protein and applying it to the face also has anti-inflammatory and calming effects, which is suitable for skin care after sun exposure.

Salt is an essential flavoring agent in our life. We must cook with it. Salt can make food taste more delicious. In China, salt has a long history.

Millions of years ago, early humans in primitive society regarded salt and water as equally important. But in the past, technology was underdeveloped and it was difficult to collect salt. In ancient times, selling salt was illegal. Later, with the development of the times, salt mining became easy and exquisite. Later, people thought of adding iodine to prevent people from suffering from big neck disease, because salt is eaten by everyone. Adding iodine to salt can ensure that everyone eats salt to prevent people from suffering from big neck disease and has achieved remarkable results. There are very few people suffering from big neck disease now.