Tang Qi said that several hard dishes made of pork would be prepared for the three of them for dinner.

Liu Che had no idea what these dishes were, but that didn't stop him from being greedy.

After finally finishing his work, Liu Che immediately asked Tang Qi about lunch.

Tang Qi was not pretentious and said directly: "You have worked hard for so long, and the fries in your stomach should be almost digested. 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 a pig?"

Tang Qi was stunned for a moment, then laughed and said, "We are just going to eat for four of us, so why kill a pig?"

Liu Che scratched his head and said, "If the pigs are not killed, how will the meat come from?"

Tang Qi shrugged his shoulders and said: "Of course I will use the pork I saved. It is impossible to kill them now. It is too troublesome!"

Killing a pig is indeed a troublesome thing.

After killing, the lard, large intestine, etc. need to be separated.

Just killing a pig may take an hour or two.

"Mr. Tang, the weather is so hot now, can pork be preserved?"

Liu Che asked Tang Qi with some confusion.

In such a high-end environment as the palace kitchen, it is impossible to preserve pork for more than two days in the summer, not to mention that on such a hot island, the storage time will definitely be shorter.

Tang Qi sneered: "You don't care whether the weather is hot or not when you store pork? You can store it for a long time just by freezing it. You don't know this common sense?"

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

Tang Qi rolled his eyes and said: "How could there be a natural ice house in a place like this? I built them all myself!"

Liu Che rubbed his chin and pondered: "Could it be that Mr. Tang stored the ice from winter until summer?"

Tang Qi sighed and said helplessly: "Old Liu, you really have no common sense at all. The climate here is considered tropical, and the temperature does not drop below zero in winter. How can it freeze?"

Liu Che has no idea what tropical climate is and what subzero temperature is.

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

"Mr. Tang, if this place doesn't freeze in winter, where does the ice for your ice house come from?"

Like a curious baby, Liu Che asked the question again.

This time Tang Qi did not laugh at Liu Che, but said rather proudly: "This involves my chemistry level. To be honest, I also got perfect marks in chemistry in high school!"

"High school? Chemistry?"

Liu Che was stunned.

In the Han Dynasty, there was no primary school, junior high school, or high school, and there were only two types: folk school and official school.

In terms of Minxue, it is a private school.

In terms of official studies, they are Taixue, Hongdumenxue, etc.

In addition, the division of subjects in the Han Dynasty was not so rigorous.

It is not like now that it is divided into Chinese, mathematics, physics, chemistry, etc.

They are only divided into calligraphy, arithmetic, martial arts, etc.

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

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

Students first go to elementary school, then middle school, and finally college, and then graduate and receive a beating from society, do you understand?”

Liu Che seemed to understand what he heard, but he still nodded and said: "I probably understand, then Mr. Tang, how do you make ice?"

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

"ah?"

Liu Che said in confusion: "Isn't saltpeter a material for making elixirs? Can it also be used to make ice?"

Saltpeter was first used in ancient theology and medicine.

Practitioners use saltpeter to make elixirs, while doctors use saltpeter to make medicine, which can detoxify and reduce swelling.

Liu Che pursued immortality and had taken elixirs made from saltpeter, so he probably had some understanding of saltpeter.

But it was still a bit hard for him to imagine what Tang Qi said about making ice from saltpeter.

Tang Qi had anticipated this.

He smiled and said: "I know you don't believe it, but it doesn't matter. I will give you a live demonstration and you will know. Follow me!"

After saying that, 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 said: "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 magician!"

Tang Qi did not respond to the two people, but led them directly into the cave.

After entering the cave, there is a downward slope.

Walking down for more than twenty meters, you will find two small cave entrances only as high as a person.

One of them was blocked by a door made of tree branches, but wisps of cold air still leaked out.

"This is an ice room that can store meat!"

Tang Qi pointed at the blocked hole and said.

Liu Che nodded and was about to speak when he heard Tang Qi continue: "Let's not enter the ice room yet. Let's go to the cave next to it and I will show you how to make ice with saltpeter!"

"Okay, okay!"

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

In his opinion, using saltpeter to make ice is already a magical method.

It's strange that Liu Che wouldn't be excited to see the gods using their magical methods with his own eyes.

Tang Qi led the three of them into the small, uncovered cave.

There are more than a dozen large stoneware jars neatly placed inside.

Tang Qi opened the lid of one of the large tanks and saw that it was filled with white crystals.

This is saltpeter.

Saltpeter, also known as saltpeter, is usually a white or gray crystal, but there are also colorless ones.

Liu Che walked over to the vat and took a look, then he praised: "Mr. Tang's saltpeter is of much better quality than the saltpeter of those Qi refiners!"

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

Liu Che smiled and said: "I just understand it a little bit. The whiter the saltpeter, the better the quality, right?"

Tang Qi nodded and said: "That's about it. It seems that you do understand a little bit. Next, I will demonstrate how to make ice with saltpeter. Watch out!"

After that, Tang Qi picked up a large spoon from the ground, scooped out a large spoonful of saltpeter, and poured it into a large tank filled with water next to it.

In an instant, the water and saltpeter reacted violently.

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

The movement was really scary.

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

Wei Zifu consciously hid behind Liu Che.

Liu Che himself didn't feel any panic, he just looked at the water vat with curiosity on his face.

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

The chemical reaction in the water tank became more intense, and water droplets emitting white mist even splashed to the ground two or three meters away.
Chapter completed!