Memoirs of an Isekai in Naruto

Log 23 Joule Thomson effect

Ok so here is the thing this topic is hard as fuck for me to explain because I never was taught this and did all my research in my free time before I started training for the Great War. 

If you grow up to be a scientist please correct me if I was stupid as it's been a long time since I was on earth and studied this and I can't find any supplementary information in the village library.

I came across this for the first time in fan fiction but later learned it was applicable to my plumbing. I found this out when working with dropping and regulating gas pressure over a control valve. The reduction in pressure I found out means a reduction in temperature. 

It makes sense when you think about it in terms of the drop in high-energy moving gas particles. If you remove the high-energy gas from a system then there will be a drop in energy and energy is heat.

If I didn't want my pipes freezing I would need to take into account that a pressure drop of 100 psi is a 6-8 degree drop in freedom unit. 

If the pressure of the gas drops too quickly and goes below freezing then any moisture in the gas or around the pipes would freeze.

So what does this mean? If you can compress a gas and release a stream of regulated air through a throttle device. If the released gas's pressure drop is high enough it can cause freezing to whatever the super-chilled gas makes contact with. This gas might even liquefy if the pressure drop is high enough.

How can this be useful? The Uchiha great fireball where a ninja releases fire from one mouth can be copied with air. If you compress the air enough and release a diffuse low-pressure wave you would drop the temperature of any fire or straight freeze enemies in their track.

A lot of air jutsu is all about creating concentrated air and releasing it as strong winds. In this application, you will need to create high-pressure wind and control its release to a small trickle to produce super-chilled air.

Training

Step one: You must learn about wind nature. 

Step two: You must learn to control the motion of the air created by wind release. This training can be done by trying to make shapes or pull objects closer with wind and not just push.

Step three: You must create greatly pressurized controlled air. Creating controlled air bullets.

Step four: You need to learn to throttle the air away from your compressed air construct. Using a tire pressure gauge controls the air coming out of the air construct to create controlled flows of air.

Step five: Step it up go big or go home and increase the pressure of your air ball the higher the pressure the greater the drop of air and the greater the volume of high-pressure air the greater the volume of cold air you can produce.

Footnote: This isn't likely the best for combat given the level of control needed but it reduces the danger of fire release. However, this is great for research where you can create highly cold temperatures which can be applied for many scientific uses. If you ever want to quit being a ninja you can sell liquid hydrogen which only needs to get to -423 freedom units. 

If you use liquid hydrogen the volume compression is about 800 times than that of gas. If you are thinking about using it for explosives we include that in our hydrogen bombs but it would be better to invent rockets, satellites, and travel to the moon. Let me tell you that there were some interesting people up there and no I didn't go myself.