"The principle of a hot air balloon is that the air inside the balloon becomes less dense when heated, and the mass is lighter than the same volume of cold air outside the balloon, so the balloon generates buoyancy and lifts into the air!"

"We don't necessarily need to use a hot air balloon, if we use another gas, a gas that's lighter than normal air, we can do the same."

"I remember when I was in the Akkadian Alchemy Academy, there were alchemists who refined a gas that was lighter than air, and we could use this gas to make an airship."

The Mack Alchemy Research Institute is mainly focused on the manufacture of cargo and manned hot air balloon airships, and a long time ago, the Alchemy Research Institute of Akkadian Alchemy was conducting this experiment, but in the end it failed, not without success.

The Mack Alchemy Institute is affiliated with the name of the Wisteria Flower Alchemy Academy, and this alchemy research project was also started, and after Lars joined the Mack Alchemy Institute, he proposed a different novel concept.

Then, over the course of several years, a new airship was born, a variety of materials were experimented with, drawings were changed from version to version, airbags were inflated and burst again and again, and brains were racked to reshape the shape and design of the airship.

In the end, it succeeded, and the huge airship carried twenty people and cargo, and flew into the sky, although it could only fly in the sky at a very slow speed, and the weight it carried was limited, and it was only able to make some close voyages, and it was also very dangerous and had all kinds of problems.

The production of airships is also very low, because the speed is very slow, it does not have much practicality, and it has not been expanded, the price is high, it is very complicated to use and has no commercial value, only some nobles and the military try to order it, but it also brings great wealth to the Mack Alchemy Institute.

At the same time, the reputation of the Mack Alchemy Institute also quickly spread within the alchemist community, and everyone discovered that it was an ordinary person, an alchemy crook with the title of fake alchemist, who created such a project that even alchemists could not complete.

The story of Lars spread among the alchemists and various alchemy academies, the story of an ordinary person who has been struggling for his dreams is always full of contagion, and the dean of the Alcade Alchemy Academy, Marina, also heard Lars's story and chose to meet Lars Brown.

After a conversation with Lars Brown, Lars Brown talked about his idea for the steam engine, saying that he was inspired by the alchemist's use of wind and water power to create a real power machine.

Lady Marina affirmed Lars Brown's ingenuity and ideas, and took Lars Brown, who was not an alchemist and had no talent for an alchemist, as a student.

At the age of forty, Lars Brown finally fulfilled his childhood and student dreams of becoming a student of the legendary adventurer and alchemist Lady Marina, and reinstated his student at the Akkadian Alchemy.

Within the Akkadian Academy of Alchemy, Lars Brown once again began the development of the steam engine, and led the project, and with the support of the alchemist, the research and development of the project was finally launched.

With the failure of the initial stage, although the steam engine was manufactured, the practicability was still very poor, and after generations of improvement and manufacturing, it finally entered into use.

The early steam engine, which was used on top of industry, used industrial production and industrial spinning, which further promoted the progress of the workshops, and various workshops using the steam engine as power quickly began to appear throughout the city of Tephers.

And Lars Brown, until his death at the age of seventy-four, had not fulfilled his promise to use the steam engine on ships, but the steam engine was brought to the world by Lars Brown, and the seeds of change had been planted.

When Lars Brown died, he was very indifferent, and gently grabbed his grandson Little Brown's hand: "As long as you have a dream, you can change your fate!" ”

After saying this, Lars Brown left, and his tombstone, as if he had made a last wish, was engraved with his nickname, the tomb of the imposter alchemist Lars Brown.

Under the tombstone, there is also the words engraved by his heir, the last words he said when he left - with a dream, you can change your fate!

In the fifteenth year of the Holy Calendar, Lars Brown's grandson, Little Brown, finally built the world's first steamship, a wooden steamship, with huge wheels so conspicuous on the ship that it had not even replaced the sails.

But this is a huge change of the times, the fleet that has been sailing in the near sea, once again launched the exploration of the deep sea and the open ocean, the holy calendar 223 years, since the great adventurer Marina Bossay arrived in the Yala Elven Continent for the first time, human beings once again made contact with the Elven Continent.

The pattern of the world has changed again, although the connection between the continents has not yet been completely opened, above the sea, there is still a world of monsters and monsters, and the route has not been completely established, but it is a sign of a change in the world.

And the era of the steam engine is far from beginning -

---------------------

In the Akkadian Alchemy Academy, Marina, who was in the dean's room, was still young and beautiful, and she finally got stuck in the boundary where her body was aging and her mental activity was decreasing, and she broke through the fourth level and became a fourth-level alchemist.

After breaking through the level four levels, they have a lifespan of 1,000 years, as long as they don't encounter accidental death or other problems, the original serious lifespan problem will be easily solved for them.

On the level of advancement, Marina is far luckier and smoother than her teacher Arcade, and at the same time much luckier than most wizards, there is only one chance, failure will lead to death and serious consequences of mental power problems, so that most fourth-level wizards would rather not break through than try easily.

Marina, on the other hand, was very interested in the steam engine made by her students: "Unfortunately, Lars did not have the talent to become an alchemist, otherwise with his wisdom, he would be a great alchemist." ”

Marina used her own alchemy table and added various metal materials to create a relatively rough steam engine, the pressure of the original steam engine was relatively low, and the valve could not be automated, so there were many restrictions on the use, and Marina also tried to improve it.

And the mechanical alchemy life on the side, Akadermon also tied Marina as an assistant, at this time, Marina looked at Arcmund and suddenly thought of something.

"How about making a steam engine out of metal cells?"

"It has power in itself, what if you treat it like a heart or an organ, make a steam engine of metal cells, and make it have some of the characteristics of alchemical life?"

"It can repair itself, operate itself, evolve itself, and can be manipulated at will according to the alchemist's ideas, if it is integrated into it with extraordinary power and refined into an alchemy prop, what kind of role will such a metal-activated steam engine play?"

Marina felt as if she had opened a door to the world of steam, and although many ideas were still very vague, Marina felt that as long as she perfected herself and built a real metal-activated steam engine, a new era of steam would arrive.