Reading Warbreaker and the amount of breath for each heightening, I noticed that the amount of breath followed some kind of exponential function. So I tried to find the math law that they follow
I started by plotting the amount of breath versus the level (Figure 1) taking into account an error of 1% for each level. This is because it is written that the amount for each level is not exact, so I assume a value that increases as the level does.
↑Figure 1: BioChromatic Breath for each Heightening
Then I tried different basic functions, but I found that it doesn’t follow those. Eventually I divided every amount by 50 (Figure 2) and by the level squared (Figure 3).
↑Figure 2: Figure 1 divided by 50
↑Figure 3: Figure 2 divided by Level Squared
With this i started to try again with this formula () and found values for A, B and C that approximated the curve. then i expanded the formula so the results approximated Figure 1, i got
Eq. (1)
Using OriginLab I plotted Figure 1, and fitted using Eq. (1). And i got Figure 4:
↑Figure 4: Figure 1 fitted using Eq. (1)
The values for this formula are:
Replacing the level we got this values:
This aren’t very accurate, but they are very near, and may be the real values that are approximated in the books. Be aware that there is an unknown error to this values, they could be less or more
Conclusion
The most probable thing is that Brandon picked random values for each level, but it still was fun to try and find out this law.
Replacing for an 11th heightening we get around 120000 breaths for it. If in the future there are more levels, and they follow this formula i would be very happy. Keep in mind they will most probably not follow this.