This question is not a question that has been through the ages, but Li Er is very curious.

Empress Changsun, Du Ruhui, and even Li Junxian, who had been standing quietly, also looked at the wooden door on the ground curiously.

The group thought of this.

At this time, the maid Mianer Ying'er, who was following Li Sheng, couldn't help but smile at the corner of her mouth.

A little proud.

Li Sheng was not surprised by everyone's reactions. Anyway, Mian'er Ying'er was shocked when she saw this ice cellar for the first time.

"Young Master, is this cold storage used to store ice?"

Li Er thought he had heard it awkwardly.

Because it is irrelevant to put ice in the cellar, it is irrelevant to think about it.

But Li Sheng just smiled.

"Of course it's not used to store ice cubes, it's used ice cubes to save other things."

“Meat, vegetables, fruits and melons…etc.”

"As for the ice, of course, it's done before putting it in!"

Li Sheng finished speaking.

Du Ruhui, Empress Changsun, Li Junxian, and Li Shimin were all stunned.

Ice cubes...

That was frozen by God.

This kind of thing can also be made manually?!

It's simply incredible!

"Young Master, how is this possible?"

"How did this be done?"

The four of them looked surprised. This time, even Li Junxian couldn't help but blurt out, "Impossible, ice cubes are godsends!"

"What's impossible?"

Li Sheng said lightly.

"It's just a trick to make ice with saltpeter."

???

...

"The method of saltpeter?"

"Isn't saltpeter a medicinal material for alchemy?"

"You can also make ice with saltpeter??"

Li Er and others were completely shocked.

This is something that has never been heard of.

Li Sheng was not surprised by everyone's reactions.

For him, the ancients were not like this, and they could be shocked by anything.

At first he was a little annoyed, but after a long time, he became accustomed to it.

Everyone was doing well, so Li Sheng explained it to these people.

This is a certain amount of saltpeter.

Chemical reactions are carried out through a simple set of equipment.

And this chemical reaction is a relatively rare endothermic reaction.

Therefore, it can take away the hot air in the water, allowing the water to continuously lower the temperature, and finally... until it freezes.

Ice is made from saltpeter regularly and stored in the cellar.

It can maintain a low temperature environment to store foods such as meat that are prone to spoilage, etc.

Of course, you can also make desserts in the summer...

There is nothing to say.

After Li Sheng finished speaking, he found that Li Er and others were stunned.

“What is a chemical reaction?”

"What is an endothermic reaction?"

"Can you actually suck away the heat? Is this a magic trick?"

Li Sheng was speechless and simply turned around, "Mian'er, go and get a few ice cream."

"Young Master, it's just early spring. You said eating ice cream hurts your stomach..."

"It's okay, it won't be possible once in a while, go."

"Yes, young master."

Mianer walked forward and squatted down to open the wooden door on the ground.

A somewhat dark passageway opening was opened, and there was a step below.

The little maid went down the stairs.

At the same time, a series of cold white steam also surged out of the passage!

The chill came to my face.

Li Er and others suddenly realized that the cellar was probably really cold.

This is early spring, and it is not very rare to say that ice is rare.

But even at this time, the river freezes,

But no one has heard of that river that can produce such a large amount of white and cold air.

Obviously, the environment inside this cellar is much colder than outside!

Everyone was secretly surprised.

And in a short while.

Mianer held a large wooden plate and climbed up the steps along the passage, and returned to everyone.

"Good guests, young master. Ice cream, please use it."

...

On the large wooden plate, there were seven or eight small porcelain bowls.

In each porcelain bowl, there is a round thing, which looks like a Lantern Festival, and there are slices of fruits on it, with different colors.

Li Sheng smiled and said, "This ice cream is a heat relief thing, so it's okay to eat it in summer. However, the cold weather has not passed recently, so everyone should go with me to try it in the living room."

"well!"

"Walk!"

...

The living room is filled with a stove and brazier, and it is naturally warm.

Because after walking for a while, everyone was even sweating a little.

It was almost a morning of sightseeing.

Soon, Mianer came over with a wooden plate and ice cream.

Present to several guests one by one.

Li Er and others looked at each other and began to taste it.

After one mouthful...

"What is this, why is it so sweet!"

"Fruit slices plus... plus this seems to be a thing of milk, it is simply a delicacy on earth."

"Extremely wonderful, wonderfully wonderful!"

This taste only took 2 seconds.

Everyone only tasted it, but the entire living room was full of admiration!

It's still cold. If it were in the hot summer, it would be even more amazing.

Even though Li Er and others were a royal noble person and were accustomed to all kinds of delicacies, they still quickly finished the ice cream in the small porcelain bowl!

...
To be continued...