How are ancient ice products made to relieve the heat?

In ancient times, the method of making summer ice products was saltpeter ice making.

"Nitrite", also known as flame nitrate and potassium nitrate, is a natural mineral with colorless, white or gray crystals and glassy luster. Now it is mainly used to make gunpowder. This kind of mineral mostly appears at the foot of low-temperature wall, and its color is like frost, so it is also called "wall frost". When dissolved in water, it will absorb heat and lower the water temperature, so when enough saltpeter is dissolved in water, it can make the water freeze quickly.

At the end of the Tang Dynasty, people mined a lot of saltpeter in the production of gunpowder, and inadvertently discovered the wonderful use of saltpeter. From then on, people can make ice in summer without seasonal restrictions.

People also use saltpeter to make cold drinks, put a jar full of water in a plate full of water, and then constantly add saltpeter to the water in the plate. Soon the water in the jar will condense into ice. This is also an important reason why iced drinks were all the rage in the Tang Dynasty. China has also become the first country in the world to make iced drinks.

Nitrate packaging method

Two layers of plastic bags or one layer of plastic bags, plastic woven bags and latex bags; Composite plastic woven bag outside plastic bag (polypropylene three-in-one bag, polyethylene three-in-one bag, polypropylene two-in-one bag and polyethylene two-in-one bag); Ordinary wooden cases outside threaded glass bottles, plastic bottles or plastic bags; Screw-capped glass bottles, iron-capped glass bottles, plastic bottles or ordinary wooden cases outside metal barrels (cans).

Matters needing attention in transportation: Railway transportation should be carried out in strict accordance with the dangerous goods loading table in the Rules for the Transport of Dangerous Goods of the Ministry of Railways. When transporting, it should be shipped separately. During transportation, it is necessary to ensure that the container does not leak, collapse, fall or be damaged. Transport vehicles should be equipped with corresponding varieties and quantities of fire fighting equipment during transportation.

It is strictly prohibited to transport alongside acids, inflammables, organics, reducing agents, spontaneous combustion articles and inflammable articles when wet. When transporting, the speed should not be too fast, and overtaking is not allowed. Transport vehicles should be thoroughly cleaned before and after loading and unloading, and it is forbidden to mix with impurities such as organic matter and flammable materials.

Reference to the above content: Baidu Encyclopedia-saltpeter