Traveling through history leaving a name

Chapter 186 The Academy
The arrival of Zhang Qingfeng added some excitement to my sister's teahouse.

During the day, the elder sister and the husband were busy serving tea and water to the guests, so they did not have much time to entertain Zhang Qingfeng. Zhang Qingfeng spent most of his time playing with his two little nephews.

In the evening, the teahouse is not closed, but the number of customers is much less.

In order to entertain his brother-in-law, Zhao Kuan asked his wife Yang Xue to buy two kilograms of meat and make a delicious meal.

"Sister, brother-in-law, your business is doing well. Why don't you sell ice water in such a hot day?" Zhang Qingfeng asked his sister and brother-in-law.

"Ice water? How can there be ice water in this summer?" Hearing Zhang Qingfeng's words, brother-in-law Zhao Kuan asked.

"Isn't it possible to make ice with saltpeter?" Zhang Qingfeng asked.

"Little brother, who did you listen to? Why don't I know?" Sister Zhang Qingfeng also asked.

"Really, maybe I made a mistake." Hearing what his sister and brother-in-law said, Zhang Qingfeng said.

He had seen a post on the Internet before, saying that people in the Tang and Song Dynasties used saltpeter to make ice.

But judging from the attitude of my sister and brother-in-law, as well as my own memory, it seems that there is no such thing at all.

However, Zhang Qingfeng wanted to try and see if he could succeed.

In the end, he bought a few catties of saltpeter from a pharmacy for a few hundred Wen, and after a series of experiments, he finally produced half a catty of edible ice water, which was several degrees away from freezing.

This result made Zhang Qingfeng want to cry, but it was really not worth the candle to produce such a small thing at such a high price.

It is theoretically possible to make ice from saltpeter, but it requires a multi-stage cooling method to make ice. Zhang Qingfeng used this method.

When the water temperature is as high as 30 degrees, throw a lot of saltpeter into it, and the temperature will drop by a few degrees at most.

Pure water at about 20 degrees can be cooled to about ten degrees with saltpeter.

In summer, the process of making ice with saltpeter is extremely complicated, and it needs to be cooled at least four or five times, and pure water must be used for cooling, because a saturated solution of saltpeter cannot continue to cool down.

Only a few degrees of pure water can be used to cool down to below zero with saltpeter, and it is still necessary to use that kind of very high-purity saltpeter.

In the whole ice-making process, the consumption of saltpeter is extremely large, and the production cost is very high.

Several catties of saltpeter were used up, and only a few taels of ice were produced, and this ice was still inedible, because it was full of saltpeter, so it could only be used to cool drinkable water and make ice water.

It can be seen that the saying that ancient people used saltpeter to make ice is simply not true, and the cost is too high, and there is no historical record that ancient people used saltpeter to make ice.

Legend has it that ancient people used saltpeter to make ice, which first appeared in the plots of online novels. The source is the experiment of making ice with ammonium nitrate in the middle school experiment.

This experiment cost almost all of Zhang Qingfeng's savings, and ruthlessly shattered his original idea of ​​making money by selling cold drinks.

"Oh? You really made ice!"

When brother-in-law Zhao Kuan saw the ice congealed in a small bowl in front of Zhang Qingfeng, he suddenly said in surprise.

"This ice is not edible, it will cause diarrhea." Zhang Qingfeng said.

Even so, the fact that Zhang Qingfeng made ice in the summer still caused a sensation in the teahouse and attracted many people to watch.

The piece of ice Zhang Qingfeng made was used by him to cool down a scoop of drinkable water, allowing him to drink a sip of icy cold water.

Other than that, it doesn't seem to be doing much.

Fortunately, the saltpeter dissolved in water can be restored after the water evaporates, so that he will not lose too much.

Zhang Qingfeng gave the method of making ice with saltpeter to his brother-in-law Zhao Kuan. Although the cost of making ice with saltpeter is too cumbersome, in order to make ice once, it often needs to be exposed to saltwater for several days.

But let alone, brother-in-law Zhao Kuan really made some money by making ice with saltpeter.

Since the saltpeter making ice was seen by many people, it has spread nearby.

Many people came here just to see how to make water turn into ice, which brought a lot of business to my sister and brother-in-law’s small teahouse.

If someone can afford enough money, brother-in-law Zhao Kuan is willing to perform a trick of freezing water in summer in public.

This matter was turned into a show by Zhao Kuan in the end, which made Zhang Qingfeng also have to admire his brother-in-law Zhao Kuan's brain.

Once a rich man came to see the performance of turning water into ice, and he even rewarded him with a tael of silver, which was enough to earn his income from going to the teahouse for several days.

Zhang Qingfeng gave this method to his brother-in-law Zhao Kuan, Zhao Kuan did not let him suffer, not only made up for his loss, but also gave him some money.

After staying at his sister's house for a few days, although Zhang Qingfeng's ice-selling business went bankrupt, his health is almost recovered at this time, so according to the family's arrangement, he should go to the academy to study.

The academy where Zhang Qingfeng is located is not far from Zhuantang Street. The location is relatively remote, but there are mountains, waters, and forests.

"Liu Cheng Academy" is the name of the academy Zhang Qingfeng studied in. This is a private school, a family private school run by the Liu family in Qiantang County.

In the past, this private school only recruited the children of the Liu family to study.

Later, in order to expand the influence of the family, the Liu family opened up the recruitment of students with foreign surnames. However, the price of studying here is very expensive, and Yang Maocai did his best to support a child like Yang Sanlang to study here. Large foreign debts.

Also because Yang Sanlang's academic performance is good, the Liu family reduced his tuition fees a lot, otherwise even if the Yang family fully provided, Yang Sanlang would not be able to study here.

Zhang Qingfeng has been recuperating at home for more than a month due to illness. According to Zhang Qingfeng's own thinking, he must drop out of school and enter the entertainment industry to develop.

But now, it's really hard for him to tell his parents.

Because the whole family has paid too much for Yang Sanlang to study, if he doesn't study at this time, it will definitely make his family sad.

Although logically speaking, these relatives are only Yang Sanlang's relatives, not his Zhang Qingfeng's.

But since Zhang Qingfeng inherited Yang Sanlang's body, he had to integrate into the background of this person's life experience, otherwise he would be too heartless, and people without conscience were condemned by thousands of people in ancient times.

The matter of dropping out of school can only be planned slowly, and Zhang Qingfeng can only hang out in the academy for now.

"Yang Sanlang, you are here!"

"Yang Sanlang, have you recovered from your illness?"

After returning to the academy, some acquaintances immediately greeted Zhang Qingfeng.

"It's all over, thank you for your concern."

As a commoner student, Yang Sanlang had a good relationship with his classmates, at least he was able to joke and get along well with his classmates.

"Yang Sanlang, during your absence, someone misses you very much!"

In a corridor of the academy, two people blocked Zhang Qingfeng's way.

The person who spoke was a woman in men's attire, even a Confucian robe could not hide her delicate and beautiful face and her slightly bulging breasts.

Next to her, there was another person who was also disguised as a man. He had a round face and looked very cute.

But at this time, she was already blushing with embarrassment, lowering her head and not daring to look at anyone.

(End of this chapter)