"Mr. Merlin, can air be liquid?"

After hearing Merlin say that the light blue liquid in Cynthia's hand turned out to be liquefied air, the little girl Alice's eyes widened and she asked him with a shocked expression.

After all, for a little girl who had never been to school, such a thing was so strange that it was as absurd as being told that meat actually grew out of the ground.

"Of course, but there are some special conditions for air liquefaction."

Merlin is a little relieved by Alice's studious and inquisitive nature, and it is a good quality to have enough curiosity about unknown knowledge, and he is sure that the little girl will be a good boy in school in the future, and he is also happy to solve the little girl's doubts.

"Alice has boiled water."

He asked the little girl.

"En, I am responsible for all the housework at home, and I am very capable."

Alice nodded, slightly proud.

"What happens when the water boils?"

Merlin asked again.

"It's going to be hot."

Alice replied confidently again.

"Well, that's smart, so if the water boils and the lid is closed, what will be behind the lid when you open the lid again?"

Merlin didn't hesitate to give a compliment, and then continued to ask.

"There will be water droplets."

The little girl who was praised smiled happily, and then replied even harder.

"That clever little Alice can tell me that water doesn't fly, so why does the water drop run onto the lid of the pot?"

Merlin looked at the little girl with a smile.

"Of course it's the heat that becomes, and the heat turns into water."

Alice was naturally not stumped by this common sense question, and she replied as a matter of course.

Merlin continued to guide this.

"Then hot gas is qi that can turn into a liquid like water, and air is also gas, so why can't it be turned into a liquid?"

He asked rhetorically.

So, Alice suddenly realized, revealing a look of "I understand".

"Then Alice knows why hot water vapor can turn into water again?"

Merlin wasn't ready to end like this, and he continued to ask questions with increasing difficulty.

And this kind of question is obviously a bit difficult for the illiterate little girl who has never been to school, she hangs her cute little head and meditates hard, but because she lowered her head, she naturally saw the remaining puddle of snow left by the snowman before.

So the clever little girl looked up happily.

"I see, Mr. Merlin, it's temperature."

"When water boils, it turns hot, when it cools, it turns into water, and in winter, it turns into ice."

Alice replied by inference, and after speaking, she looked at Merlin with an expectant look, and her big eyes almost directly wrote "ask for praise".

"Little Alice is awesome, she's amazing."

Merlin naturally won't let the little girl down, he thought a little funny that the little girl really understands, while reaching out and touching Alice's head, the soft blonde hair feels good, by the way, when the head is touched, the little girl's comfortable squinting eyes always make Merlin a little doubtful whether the child is a cat.

"It's temperature, I think theoretically all matter in this world has three forms, that is, the solid state of ice, the liquid state of water and the gaseous state of water vapor, and the key to the conversion of these three forms is temperature."

Merlin was stroking little Lori, but at the same time he was watching Cynthia and the old headmaster explain.

"It's just that the temperature required for the three-state conversion of different substances is different, like water vapor, a cold pot lid is enough to liquefy it, but the temperature required for air liquefaction is very low, which is an ultra-low temperature that can never be reached under normal circumstances, so you have never heard of liquid air."

This kind of thing that Alice can understand, Cynthia and the old headmaster naturally can't not understand, in fact, there is no need for Merlin to explain, the two of them will understand it after a little pondering, they have long known the knowledge of the changes in the three states, and they also know that it is the temperature that affects these three states, but this kind of common-sense thing has long been integrated into people's lives, so it will always be ignored subconsciously, and no one has been crazy enough to try Air Liquide before, To be more precise, no one associates water vapor with air at all.

"Knowledge comes from life, it is really worthy of Your Highness, to be able to notice the details of this kind of life, and then get such knowledge from it, you can't help but remind me of the gravity sage Isaac predecessor of the Wizards Association, it really makes us metrics who only know how to read dead feel ashamed."

The old headmaster said with a look of shame.

It's just that his words also made Merlin stunned.

What's that? Gravity Sage? Isaac?

Rub, I've run to another world, why did Newton chase after him, and the other world that said that he was angry with Newton? Damn, who didn't press this big guy's coffin board.

He complained silently in his heart.

On the other hand, Cynthia was more interested in the final expansion and cooling step of the experiment than in the three-state transition.

"Expansion endothermy, compression exothermy, interesting and interesting, the reversal of common sense of thermal expansion and cold contraction? If you think about it, the scalds caused by steam leaks in factories are much more serious than those caused by hot water, even if they are caused by the heat released when the steam turns into mist. ”

It didn't take Merlin to explain, she pretty much deduced the conclusion herself, and then her eyes became shiny and shining.

She felt that with such interesting new knowledge, it seemed that she could come up with a new fire forbidden spell and an ice forbidden spell, and it was time to abdicate the name of the strongest ice and fire forbidden spell of the Ice Age and the Eternal Sun.

Well, this ghost woman is a traditional wizard in the end, and her first impression of knowledge is if it is converted into strength.

And the thought of waiting for her to research the new forbidden spell and then take it to this year's meeting of the sages to pretend to be a big man, Cynthia was satisfied.

So, in a good mood, she stepped forward and hugged her lovely brother and rubbed it hard into her arms.

"It's really worthy of my younger brother who was brought up single-handedly, and I have the demeanor of my sister at the beginning."

Merlin, who felt as if he had been taken advantage of, was a little speechless.

Tsk, sister, don't you have any points for your half-elf figure, you're just barely panicking, not much better than a file steel plate, and you're a guy who only sees me once a month and is embarrassed to say that you brought me up, obviously it's all the credit of Weier, okay, so can you let me go and change to the maid chief?

emmmm, forget it, let's wait for the chief maid's curse to be lifted.

"Don't make a fuss, sister, back to the topic, how about letting you decompose the air?"

Merlin struggled to break free from the arms of a ghost woman who had a tendency to become a ghost sister, and he asked with a serious face.

"Sister, aren't you still at ease? You are a brother with a conscience. ”

Cynthia, who was broken free by Merlin, was a little regretful, it seems that her sister's loving hug can't touch her younger brother, she waved her hand with some resentment.

Three small cubes floated in front of several people's eyes, one of them was still a light blue liquid, but compared to before, this light blue liquid was only about one-fifth, and the other two cubes seemed to be empty.

"According to your instructions brother, the temperature of the liquid air has been raised a little, according to your theory that the temperature of different substances is different, there are indeed two gases that have decomposed one after another, plus the ice that I have never seen before, sure enough, the air is just like what you said, brother, it is not one kind of gas, but a combination of multiple gases."

Cynthia cleaned up her mood, and she looked at Merlin's eyes with even more relief and pride.

"Brother, based on this discovery alone, the Medal of Truth in the Hall of Truth this year should be yours, and your new definition of flame before is really interesting, congratulations, brother, you can still get a Templar Church Torch Medal this year, sister, I will try to do some new witchcraft according to your theory, brother, it is not very difficult for me to find the Merlin Medal of the Wizarding Association, and the three most authoritative medals in the mainland this year are all our family."

A wisp of fire appeared in Cynthia's fingertips, and she sent the flame into the cube containing the blue liquid, and the next moment, the flame exploded, and the flames filled the entire cube, and the bright light of the fire also illuminated the eyes of everyone present.

Including the golden eyes that had come to the edge of the playground at some point.