Tang Qi said that at dinner, he would prepare a few hard dishes made of pork for the three of them.

Liu Che didn't know what these dishes were at all, but that didn't stop him from being greedy.

Finally finished the work, Liu Che immediately asked Tang Qi about lunch.

Tang Qi was not hypocritical, and said directly: "You have worked hard for so long, the fries in your stomach should be almost digested, and I can prepare lunch for you now." ”

Liu Che said excitedly: "Mr. Tang, are you going to kill a wild boar to cook for us?" ”

"Kill pigs?"

Tang Qi was stunned for a moment, and then smiled: "Let's just eat for four people, what kind of pig will we kill?" ”

Liu Che scratched his head and said, "Then if you don't kill the pig, how will the meat come from?" ”

Tang Qi shrugged his shoulders and said, "Of course it's with the pork I saved, it's impossible to kill it now, it's too troublesome!" ”

Killing pigs is indeed a troublesome thing.

After killing, the lard, large intestine, and so on are separated.

Just killing a pig may not be done in an hour or two.

"Mr. Tang, now that the weather is so hot, can the pork still be saved?"

Liu Che asked Tang Qi with some confusion.

With such a high-class environment as the palace dining room, it is impossible to store pork for more than two days in the summer, let alone on such a hot island, the storage time must be shorter.

Tang Qi sneered: "Do you still need to store pork, whether the weather is hot or not?" , you can keep it for a long time if you freeze it, and you don't know this common sense? ”

Liu Che suddenly said: "Oh, I understand, could it be that there is a natural ice house on this island?" ”

Tang Qi rolled his eyes and said, "How can there be a natural ice house in this kind of place, I built it myself!" ”

Liu Che rubbed his chin and muttered, "Could it be that Mr. Tang stored the ice in the winter until the summer?" ”

Tang Qi sighed and said helplessly: "Lao Liu, you really don't have any common sense, this is a tropical climate, and the temperature will not fall below zero in winter, how can it freeze?" ”

Liu Che didn't understand what a tropical climate was and what sub-zero was at all.

But he at least understood that this place doesn't freeze in winter.

"Mr. Tang, if this place doesn't freeze in winter, then where does the ice you use to build the ice house come from?"

Liu Che threw out the question again like a curious baby.

This time, Tang Qi did not laugh at Liu Che, but said quite proudly: "This is going to involve my chemistry level, to tell you the truth, I am also a person who has received a perfect score in chemistry in high school!" ”

"High school? Chemistry? ”

Liu Che was stunned.

In the Han Dynasty, there was no primary school, junior high school, and high school, and there were only two kinds of private and official studies.

In the case of folk studies, it is a private school.

In terms of official learning, it is Taixue and Hongdu Gate Learning, etc.

In addition, the sub-disciplines of the Han Dynasty were not so rigorous.

Unlike now, it is divided into Chinese, mathematics, physics, chemistry, and so on.

They are only divided into calligraphy, arithmetic, martial arts, and so on.

Therefore, Liu Che is very unfamiliar with the terms "high school" and "chemistry".

Fortunately, Tang Qi was in a good mood and explained: "High school is a senior high school, and in our Penglai Xiandao, educational institutions are divided into three levels: primary school, middle school and university.

Students go to elementary school, then middle school, and finally college, and then graduate to be beaten by society, you know? ”

Liu Che didn't seem to understand, but he still nodded and said, "I probably understand, so how did Mr. Tang make ice?" ”

Tang Qi snapped his fingers and said, "It's very simple, use saltpeter, that is, calcium nitrate!" ”

"Huh?"

Liu Che was stunned: "Isn't saltpeter a material for alchemy?" Can it also be used to make ice? ”

Saltpeter was first used in ancient theology and medicine.

Qi refiners use saltpeter to make pills, and doctors use saltpeter to make medicines, which can detoxify and reduce swelling.

Liu Che pursues immortality, and has also taken pills made of saltpeter, so he probably knows a little about saltpeter.

But what Tang Qi said about saltpeter making ice, he was still a little hard to imagine.

Don Qi had already expected this.

He smiled and said, "I know you don't believe it, but it doesn't matter, I'll give you a live demonstration, and you'll know, follow me!" ”

After speaking, Tang Qi took Liu Che, Wei Qing and Wei Zifu to a nearby cave.

Standing at the entrance of the cave, you can already feel the slightest chill coming from inside.

Wei Zifu shuddered, and couldn't help but say: "The chill in this cave is even worse than the ice room in the palace!" ”

Liu Che nodded in agreement: "That's true, it seems that there must be a lot of ice stored in it, Mr. Tang is really a fairy method!" ”

Tang Qi didn't respond to the two men, but led them directly into the cave.

After entering the hole, there is a downward slope.

Walking down more than 20 meters, there are two small holes that are only one person high.

One of them was blocked by a door made of tree branches, but there were still wisps of cold air peeping through.

"This is an ice room where you can store meat!"

Tang Qi pointed to the hole that had been blocked.

Liu Che nodded, and was about to speak, when he heard Tang Qi continue: "Let's not go into the ice room first, go to this hole next to it, and I'll show you how saltpeter makes ice!" ”

"Good, good!"

Liu Che agreed again and again, with an excited look on his face.

In his opinion, making ice from saltpeter is already a fairy method.

Being able to see the immortals using immortal means with his own eyes, it is strange that Liu Che is not excited.

Tang Qi led the three of them into the uncovered hole.

There are more than a dozen stoneware vats neatly placed inside.

Tang Qi lifted the lid of one of the large vats, only to see that it was full of white crystals.

This is saltpeter.

Saltpeter, also known as nitrate, is generally white or gray crystals, but it can also be colorless.

Liu Che leaned over to the vat and took a look, then exclaimed: "Mr. Tang's saltpeter is much better than the saltpeter of those qi refiners!" ”

Tang Qi looked at Liu Che and said, "You still understand the quality of saltpeter?" ”

Liu Che smiled: "I just understand a little, this saltpeter should be the whiter the quality, right?" ”

Tang Qi nodded and said: "Almost, it seems that you do understand a little, and then I will show saltpeter ice, you are optimistic!" ”

With that, Tang Qi casually picked up a large spoon from the ground, scooped a large spoonful of saltpeter, and poured it into the large vat filled with water next to him.

In an instant, the water reacted violently with saltpeter.

The water was churning, and there was a faint sound of explosions.

The movement is a bit scary.

Wei Qing couldn't help but block in front of Liu Che, for fear that something would happen and hurt Liu Che.

Wei Zifu consciously hid behind Liu Che.

Liu Che himself didn't have any frightening emotions, just looked at the water tank with curiosity on his face.

Next, Tang Qiyou scooped two spoonfuls of saltpeter and poured them into the water tank.

The chemical reaction in the tank was even more violent, and the water droplets emitting a white mist even splashed on the ground two or three meters away.

Wei Qing was also splashed with a few drops on his body, which made his expression change suddenly......