Function observedKettleBuffering

observedKettleBuffering(
    input: {
        acid: AcidId;
        amount: number;
        concentrationPercent?: number;
        phAfter: number;
        phBefore: number;
    },
): number
| null
The buffering measured on one brew day, mEq per pH unit, or null.
```
buffering = amount × strength(acid, at the pH it landed on) / (before − after)
```
Returns null when the reading after the dose isn't below the reading before it, or when nothing was added. In both cases there's no measurement. It isn't a measurement of zero. A meter that reads the same number twice means the dose was too small to see, not that the wort has no buffering, and a zero in the median would pull every later dose toward nothing.
Parameters
- input: {
      acid: AcidId;
      amount: number;
      concentrationPercent?: number;
      phAfter: number;
      phBefore: number;
  }
  - Readonlyacid: AcidId
  - Readonlyamount: number
    
    How much went in, mL for a liquid acid and g for a solid.
  - Optional ReadonlyconcentrationPercent?: number
    
    Strength, % w/w. Defaults to the acid's own default.
  - ReadonlyphAfter: number
    
    pH after it was stirred through.
  - ReadonlyphBefore: number
    
    pH before the dose went in.
Returns number | null
- Defined in kettlePh.ts:257