For an ancient man.

Of course, he wouldn't know how to make ice cubes.

After all, all of this involves the knowledge blind spots of the ancient people.

Even many modern people don't know how to make ice cubes.

The reason is simple.

There will be refrigerators in later generations.

Who's so meowy, nothing to care about this?

Therefore, many people in later generations did not know how to make ice cubes.

However, Ying Changsheng knows how to make ice.

After all, compared to other things that require knowledge of chemical physics.

Ice making is pretty simple.

It's a fool's errand.

I only heard the way of winning immortality.

"Tell someone to get two copper basins, and by the way, get some saltpeter, and I can successfully make ice cubes!"

"Is this that simple?"

Brother Zheng was eating roasted sweet potatoes and asked incredulously.

After all, no matter how he thought about it, he would never figure out that this saltpeter, copper basin, could actually be made into ice cubes.

"Of course, if you don't believe it, give it a try, won't it be clear?"

Win Changsheng said confidently.

On the side, when Brother Zheng heard this, he waved his hand and instructed the eunuchs next to him.

"Follow the immortal's instructions, go and get the things you need!"

"No!"

The eunuchs did not dare to slack off, and hurriedly went to prepare.

Not long after, the things that Win Changsheng needed were brought over, there were several copper basins, Win Changsheng was in it, and he picked out a large and a small, two copper basins, only to see him order.

"Go get some water!"

"No!"

The eunuch next to him hurriedly went to the well not far away, and then brought over two buckets of water, and then, only to see Ying Changsheng, first poured the basin into the large copper basin, and then put the small copper basin into the big copper basin, and then added water to the small copper basin.

Immediately, he took out a few pieces of saltpeter from the bag of saltpeter hastily brought by the eunuchs and threw them into the large copper basin.

Saltpeter, in Daqin, is still mined.

The use of this thing in the current Daqin is also very simple, it is nothing more than to use it as a medicinal herb.

No one knew that this thing could also make ice cubes.

I only saw Ying Changsheng, from time to time into the copper basin, throwing a piece of saltpeter, at a speed visible to the naked eye, only to see that the water in the large copper basin began to emit a trace of white gas, and the surface of the copper basin also began to condense water droplets because of low temperature.

It was Brother Zheng who looked at it, and his face was full of surprise.

With a look of curiosity, it is obvious that Brother Zheng doesn't know much about the principle of this.

At the same time, Win Changsheng continued to add saltpeter, and after a short time, he saw that the water in the big copper basin seemed to have formed ice, and the thermal conductivity of copper was very good. ，

The water in the small copper basin also began to freeze slowly, and it was Brother Zheng's face that was incredulous.

"This, this thing, can really be used to make ice cubes!"

"No, when saltpeter meets water, it produces ice, and if it is, it will be made into ice!"

Ying Changsheng nodded, and then, after looking at the ice cubes that had gradually formed in the copper basin, he ordered the eunuch.

"Go to the melon field in the distance, pick a big watermelon and come over, and eat it with my father and the emperor on ice!"

"Yes, Nineteen Sons!"

The eunuch hurriedly said, not daring to be the slightest bit lazy, and then gave Ying Changsheng a big watermelon.

At the same time, Ying Changsheng had already finished making ice, he put the watermelon in the ice, froze it, and said to Brother Zheng next to him.

"How about it, father, it's still quite easy to make ice, right?"

"It's easy, it's just that it's too much saltpeter......"

Brother Zheng glanced at the ice cubes in the copper basin and couldn't help but mutter.

This ice cube, though can be used in the summer, to relieve the heat.

However, his cost is too high.

Using saltpeter to make ice, after all, is too wasteful, a small amount is okay, if there is more ice to make, how much saltpeter is needed to be enough?

Hearing this, Ying Changsheng shook his head and smiled.

"No waste, no waste at all!"

"Oh?"

Brother Zheng was a little surprised, but Ying Changsheng explained to Ying Zheng.

"After this saltpeter is made into ice, it will not be completely wasted, on the contrary, it can be reused!"

"Oh?"

Brother Zheng was a little surprised, he pointed to the ice cubes in the basin and said.

"This saltpeter has melted into the ice, how can it be reused?"

"Simple, wait until the ice turns into water, put this copper basin under the sun, expose it to the sun, and then, after all the water evaporates, saltpeter will reappear at the bottom of the basin, at that time, you can continue, use this thing to make ice!"

"How else can you do that?"

Brother Zheng only felt shocked and abnormal, but Ying Changsheng said with a smile.

"Of course you can, in this way, wouldn't the cost be very low? All you need is some saltpeter, and in the summer, you can continue to use ice cubes to relieve the heat......"

"That's right!"

Brother Zheng sighed with emotion and couldn't help but admire.

"There is still a way to live forever, if it were me, I would never have imagined that I could use this saltpeter to make ice cubes!"

"Haha, what is this!"

Win Changsheng laughed a few times.

Immediately, he looked at the watermelon in the basin, and felt that the time was almost up, so he said to Ying Zheng.

"This watermelon is probably already cold and ready to eat!"

"What kind of melon is this watermelon?"

Brother Zheng's question.

He hadn't eaten a watermelon yet, and Ying Changsheng explained.

"A particularly delicious melon, my father tasted it, and he knew that this melon was quite delicious!"

After speaking, Ying Changsheng waved his knife, cut the watermelon on the stone table, and after cutting it, handed it to Brother Zheng, and Brother Zheng, after taking a small bite tentatively, was suddenly shocked by the juicy and sweet taste of the watermelon, and couldn't help but sigh.

"This watermelon is really delicious!"

As he spoke, Brother Zheng began to eat watermelon in a big gulp.

You have a piece, I have a piece, and after a while, a large watermelon will all enter the belly of Ying Changsheng and Brother Zheng.

After eating and drinking, Brother Zheng remembered that Ying Changsheng was going to make wine, and he couldn't help muttering.

"Since this is since, my Daqin will not be short of food in the future, and you kid can use this worthless, high-yield sweet potato to make wine, I thought about it for a while, and after Daqin, I can't help but drink!"

"Father is wise!"

Win Changsheng Chaozheng brother and send a sycophant.

Brother Zheng, on the other hand, waved his hand and shook his head.

"This decree should have been changed according to the time and place, instead of blindly sticking to the rules, my Great Qin's laws have been changed countless times, and this time it is not bad!"