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Background Pony #3652
think it’s established Rainbow Dash is cooler… but then again Cooler… NAH he’s a prick.
Cirrus Light
Economist -
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Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.
Helpful Owl - Drew someone's OC for the 2018 Community Collab
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Friendship, Art, and Magic (2017) - Celebrated Derpibooru's five year anniversary with friends.
An Artist Who Rocks - 100+ images under his artist tag

Sciencepone of Science!
@Dirty Bit  
@Dustcan
 
Boiling point of N2: -196C / 77K  
Boiling point of LH2: -253C / 20K  
Boiling point of Helium: -269C / 4.2K
 
Afaik, nothing is colder than liquid helium (lower boiling point) - but liquid hydrogen is way colder than liquid nitrogen.
 
It was a liquid helium leak that set the Large Hadron Collider back. ^[1] News sources called it an “explosion” - which it was, but it was an interesting kind of one… An explosion is a rapid expansion of gasses blasting outward with a great deal of force. Heat actually isn’t a requirement. Just see what happens if you whack a SCUBA tank open. BAM. But normally explosions are driven by heat - if you suddenly heat a small pocket of air a huge amount, it will want to expand, so it will - very rapidly. Kaboom. But in this case, it wasn’t some normal material suddenly being heated to thousands of degrees to expand outwards - it was liquid helium being heated to room temperature, but the temperature difference was just as great as any explosion, so an explosion it was - “with sufficient force to break [nearby] 10-ton magnets [] from their mountings.”
 
Here’s a fun thing,
 
Ideal gas law: PV = nRT. Let’s fix V and n as constants, and ignore constants since we’re doing a rational comparison (you can ignore coefficients in this type of analysis). This is equivalent to saying, we’re going to hold the volume and the amount of material the same, and watch to see how the pressure varies in response to varying the temperature.*
 
P = T  
14.7 psi = ~4K = 1 atmosphere
 
Room temperature is ~293
K. So we have to multiply the whole equation by 293/4 = ~73 to get the right pressure.
 
1,073 psi = 293K = 73 atmospheres.
 
That’s the same explosive force as heating room temperature air (293
K * 73) to 21,389K, or 21,096C, or 38,005*F.
 
The force could be up to 4x or 8x greater or so if they were running it even colder, which was probably the case since it was a coolant (it needed to take on some heat without boiling, so you need some room before hitting boiling point).
 
  • In physics terms, we’re dividing both sides by V, and holding nR/V constant. I should’ve technically written a coefficient in on one side of those equations, but this still works just as well since I know exactly what I’m doing.
Sollace
Lunar Champion - Led the charge of major battles for the New Lunar Republic, bringing swift and crushing defeat to the forces of the Solar Empire (April Fools 2023).
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Wallet After Summer Sale -
Friendship, Art, and Magic (2019) - Celebrated Derpibooru's seventh year anniversary with friends

I am the night!
Clearly Dash is at least 20% cooler.
 
What we really need is a comparison between two Rainbow Dashes to see which one of those are cooler.