Volume 7 - Chapter 14 – Sneaking Into the Ruins (1/2)
07-14 Sneaking Into the Ruins
After that, they had lunch in the carriage. The butler Claude tactfully went outside to eat, and it made Jin feel a bit guilty, but no matter how Jin tried to persuade him he stubbornly didn’t listen and so that’s how things were.
The dinner was bread and fruit prepared beforehand. And then at the critical moment Jin took out his thermos flask.
“Ah, hot. Why?”
Elsa was surprised that the Teee inside the thermos flask had retained its warmth. Jin smiled and,
“That’s something called a ‘thermos flask’.”
He explained.
“Does it use magic?”
Elsa tilted her head and asked.
“No, it keeps the contents warm as if it used magic, but it doesn’t utilize any particular magic. Although I did add [Clean-up]’s Magi Formula to it, but that doesn’t have any connection with the heat insulation.”
“Then, why?”
“Yeah, I’m also interested.”
As not just Elsa but also Reinhardt was interested, Jin adjusted his sitting posture to begin explaining while drinking the Teee.
“This is also something I learned from my teacher, but there’s three ways to transmit heat.”
He began like so. Both Reinhardt and Elsa were listening intently.
“First is conduction. It’s the transfer of temperature between objects.”
“Uh-huh, if I put a metal spoon in hot soup, the handle will soon become hot.”
It seemed that Reinhardt immediately digested it.
“Next is radiation. When you hold a hand out near a fire it gets warmer, right?”
After the question this time Elsa replied.
“Mm. Even from a distance, it’s warm. You say that’s radiation?”
Jin gave a nod to Elsa’s question, and started to speak of the third way.
“The third one is convection. As air or water for example warm up they become lighter and ascend, and as cold air is heavier it comes down. Convection is the repetition of this cycle the air does.”
“I see, so when you heat up a cold room with a fire, and the ceiling is warm while the floor is cold, it’s that.”
Reinhardt said, and Elsa also spoke of her experience.
“A bath. Without stirring it, only the top is hot while the bottom is cold.”
Jin clapped his hands together and,
“That’s right. You two are good, huh.”
He spoke well of them.
“So, this thermos flask, the walls of the container have a hollow structure, and the air inside has been drawn out. Having done that, there’s no way for heat to escape using convection or conduction.”
Jin said, and Reinhardt’s face lit up,
“And so that’s why it doesn’t cool down very much! Amazing, Jin, what’s that discipline called?”
He got somewhat excited.
“It’s ‘science’. It’s the study and attempt of explaining all the phenomena of nature.”
Jin explained, and Elsa gave out a rare smile,
“I see now. One of the reasons Jin-kun is amazing is that he knows this science thing. That’s why all the Magi Tools Jin-kun constructs make sense.”
She said. Jin nodded and,
“Elsa, that’s exactly right. The science I learned from my teacher, they learned from their teacher, who again learned from their teacher, and like that it is the knowledge attained after thousands of years.”
He explained.
“Hmm, I would’ve also liked to be taught by Jin’s teacher!”
Reinhardt said, seeming frustrated. Possibly the reason Reinhardt hadn’t asked prying questions regarding Jin’s teacher was out of consideration for him.
＊ ＊ ＊
Day turned to night.
The moon that told of was hanging right in the middle of the sky. That meant it was minutes to midnight.
“Now then, shall we go?”
Reinhardt asked in a low voice.
“Yeah.”
Jin agreed.
“…”