Rui lost track of ti as he grew imrsed in fleshing out the theoretical fraworks of the two projects. The many possibilities that existed with Project Muspelheim were, in particular, difficult to parse through.
"Friction is not a bad idea for a heating technique."
In fact, friction was the reason that all chanical processes yielded heat. It was an extrely natural source of heat and, in so chanical processes, produced so much heat that extra cooling units needed to be put in place just to ensure that friction did not cause them all to lt.
Back on Earth, in recognition of how great a source of heat it was, there even existed welding thods known as friction welding that used the trendous heat that friction could generate to heat up two objects and weld them together. It was especially used for tals that had high lting points and was an efficient way of getting them to weld.
It was an extrely powerful candidate for the Muspelheim technique that Rui was seriously considering.
"The issue is that it requires at least one solid object."
Friction existed the most between solid-state objects with bound molecules and atoms. If they were not bound, then these particles would only collide with each other and move away.
"It might not be fit for heaven-bending generation, but it works well with earth-bending heat generation." Rui realized.
Earth bending involved manipulating the soil and bedrock beneath one's feet to use it in combat. It was most fit for friction-heating to create the high-temperate environnt of Project Muspelheim.
"Alright, friction-heating for earth-bending it is…"
That was a rather simple choice.
While his other domain techniques paid more weight to heaven-bending, he couldn't do the sa for Muspelheim.
The planet was an enormous heat sink. He needed to ensure that the lands beneath his feet were equally hot; otherwise, the heat he generated in the atmosphere would only transfer to the ground, which was at a lower temperature. He would lose almost all the effort that he put into heating it up.
"I'll need to start mastering friction-heating through earth-bending as soon as possible," Rui made a ntal note to the training phase of Project Muspelheim.
For each technique he created, he also needed to create an efficient and optimal training regi. In so ways, it was even more important than the theoretical frawork of the technique. A poor quality training regi could not only fail to get the user to a satisfactory degree of mastery, but waste a lot of ti in the process.
"Ok, friction-heating for the earth-bending aspect of Project Muspelheim, but for heaven-bending, I need sothing that works well with gases."
'Heaven,' in the context of domain Martial Art, was rely the atmosphere and the air around the user. It was ideal to go for heating thods that were primarily centered around gaseous heating.
"Convection is powerful, but it's not easy to control, and in gases, it also moves against gravity."
Convection was a form of heat transfer that transferred heat through the movent of heated liquids or gases. In the context of Project Muspelheim, it would an heating his breath to an extrely high degree before exhaling and bending it to spread across the entire atmosphere.
"It will definitely yield the highest temperature, but…" Rui's expression grew complicated. "It takes more ti because the quantity of breath in my lungs is limited."
No matter how powerful his lungs were, his lung capacity had firm limits. His body had a fixed size, which always ant that the amount of breath stored in it had fixed limits that no amount of training would ever improve.
The limited amount of breath per inhalation ant that it would take a lot of ti to heat a lot of area.
Rui's eyes lit up as an idea popped up in them. "I…can increase the density of the air stored in my lungs."
This was ordinarily an impossible feat as the lungs of the Martial Body sorely lacked the power to convert a gas into a solid through sheer force, but the power of the Martial Heart was great enough to do that. That could partially mitigate the limited volu to a certain extent.
"I'll need to conduct several tests and trials."
While he could mathematically model the outcos and simulate them inside his Mind Palace, it did not beat actual empiricism. However, even putting aside the outco, heating the breath inside his lungs was not a part of heaven- bending. Heaven-bending happened after exhalation. Heating his breath inside his lungs was sothing that happened before exhalation.
"Even if I heat air in my lungs and exhale to heat the heavens using convection, I still need to figure out the exact manner in which I am going to bend the heavens."
Convection was sothing that didn't require heaven-
bending. Just exhaling heated breath would be enough for convection, but it was not heaven-bending.
Fortunately, Rui had several ideas.
"Gay-Lussac's Law." His eyes lit up with excitent. "It's perfect for this domain."
Gay-Lussac's Law was a law of Thermodynamics that governed gases. It that stated that the pressure exerted on an ideal gas, with a constant mass and constant volu, was directly proportional to the temperature of the gas.
In other words, as long as the size of a gas was unchanged, more pressure was equal to more temperature.
"If I use heaven-bending to create a domain with unchanging volu while also using heaven-bending to apply pressure to it, I can heat up the entire domain trendously." Rui grew engrossed in the technique. "In fact, I can modify Heavenly Convergence to apply pressure to an entire domain. That way, I can skip progress by using stuff I've already mastered."
Thus, not only would he heat solidified air in his lung with pressure such that it would heat his domain with convection, but he could also then bend the heated breath to bend heaven to apply the Heavenly Convergence technique on an entire domain rather than a single person.
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