People in ancient times for summer to dignitaries of ice is how come?
Nitre. It is a kind of bitter taste white crystals, minerals, like to stay at low temperature, under the foundation of color such as frost, so also known as "wall cream". It inadvertently found saltpeter dissolves in water will absorb a lot of heat, make the water temperature is reduced, or even to freeze. So quickly was used to the characteristic of saltpeter, made in the summer ice drink, sugar and a little spice dissolve in the water, then put the water into the tank; Take a broader market, in the pan, put the pot dish inside water, constantly in the dish with nitre, the results of the tank water into ice. Taste, sweet and cool, ice to the stomach.
Nitre chemical name is called potassium nitrate, when it dissolves in water absorption of heat, the temperature is reduced, so the small basin of water will be frozen. Pour some water in a large bowl, add a small bowl, small bowl also poured a basin of water, then pour into nitrate in a big basin, the water in the small basin will be frozen. The ancient ningbo ice-making will use this method to make ice.
Saltpetre dissolve in water can be used after cooling crystallization or evaporation crystallization hair will saltpeter again repeated use. Suggest using chemically pure ammonium nitrate instead of chemical reagent shop sells, effect is more obvious.
The earliest ice cooling drink originated in China. The late tang dynasty, people in the production of gunpowder produce a large number of saltpeter, from then on, people can in the summer the ice. Gradually appear after the business, they add sugar to attract customers in the ice. The song dynasty, the merchants also add fruit or fruit juice in it. Yuan dynasty businessmen and even in the ice and fruit pulp and milk, and modern this ice cream is very similar.
Keep every November, four nine days, namely have cut ice, ice, belongs to the event. Of "qing" xiaohong, clear water collectors department hidden ice "the cloud:" to take the imperial river cutting ice... years old and a half months after the winter solstice, ministries department officer, raise cutting ice, take its bright and clean, the thicker feet five inches for... for male Xie... set heat soup." Still have the customs of the republic of China.
Cellar ice age old traditional customs. Also known as "ice". In north China summer heat, winter freezes, it is hidden in the winter, ice in the ice cellar for summer to use reveals. The common origin is very early. Ancient have special management of officials, and has a cellar ice ice "well". Song Gao Cheng things JiYuan cloud: "the rites of the iceman, palm, chopped ice cream." Wei Zhi "cloud: take a 19 years, su Cao Caozao this table to hidden ice, for ling room, so the ice well. Space in the qing dynasty in three kinds: officer, icebox, burn of icebox, merchant icebox.
How much is the proportion of saltpeter ice?
In short: in a VAT, inside put half full of water,
Place the cylinder in a pool, pool place raw nitrate,
Then pour water into the pool, a long time, can. Nitrate is dissolved in water will absorb a lot of heat, cooling the water to freeze, since then, there is ice in summer
Saltpeter dissolve in water can be used after the cooling crystallization or evaporation crystallization hair will saltpeter again mentioned reuse for matching you can test a few times more, if you do not freeze can increase gradually
Saltpetre suggest using chemical reagent shop sells chemical pure ammonium nitrate instead of effect is more obvious.
Ammonium Nitrate is white prilled crystal, which has strong moisture absorption and agglomeration. It easily explodes under the action of calefaction or detonation agent. And it is easily soluble in water, methanol, acetone and liquid ammonia. It is mainly used in making ammonium nitrate explosives, emulsion explosives, refrigerating agent and nitrogen oxide adsorbing agent, as well as glass industry, medicine and fertilizers etc.